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Dr Andrea Robertson is an Osteopath, Naturopath, and Nutritionist. The information shared in this podcast is for educational purposes only and does not constitute medical advice. Always consult your healthcare provider before making changes to your health regimen.

Show Notes

Episode Transcript

Episode 11 - Soy

[00:00:00] If you've tried HRT and it has not agreed with you, or your symptoms are being driven by conditions like endometriosis or heavy bleeding, that is exactly the gap that well-researched soy isoflavone use can fill. So let's deal with it properly, because half-truths on this topic have caused real harm and real fear for a lot of women

Our sponsor today is Mineralite, an Australian electrolytes brand. And I have to tell you how I found them because this is a genuine story. Now, I'm really into paddle tennis, some may say obsessed , and a friend of mine introduced me to Mineralite to use for my hydration support during games. I was a little curious because I'd been recommending clients avoid those terrible sugary sports drinks for years, but I wasn't really sure what other options were available.

I now know that Mineralite is the option I'll recommend. It's unflavored and contains no sugar, no sweeteners, no artificial colors, no nasty additives. Just clean electrolyte support in drops you can add to your water or any hot or cold drink. [00:01:00] And my paddle? It was noticeably different. My energy held, my focus held, and I even won some games.

Mineralite is now in my water every single day. Go and check them out at mineralite.com.au or find them in most pharmacies and health food stores throughout Australia and New Zealand

Andrea: If you have ever been told by a friend, a magazine article, or even a well-meaning practitioner to avoid soy because it will mess with your hormones or raise your breast cancer risk, I want you to hold that thought for the next 30 or 40 minutes. Because what I'm about to share with you is not my opinion.

It is the current clinical research, and it tells a very different story. This episode might truly change what you reach for in your kitchen and your supplement cabinet.

I'm Dr. Andrea Robertson, osteopath, naturopath, and nutritionist. Here, we nourish because food is medicine, and what you eat changes everything.

We heal because the body has an extraordinary capacity to [00:02:00] self-repair when we remove what's blocking it. And we rise because feeling well isn't the destination, it's the foundation for living the life you truly desire.

This is Nourish, Heal and Rise 

Before we begin, a quick and important note. Everything I share on this podcast is for educational purposes only. It's not personal medical advice, and it can't be, because in the context of this podcast, I don't know your health history, your medications, and what else is happening in your body. What I want this podcast to do is give you the knowledge to ask better questions, understand your body more deeply, and make more informed decisions in partnerships with the practitioners who do know you.

If something resonates and you wanna take action, please work with a qualified healthcare provider who knows your full picture

Andrea: Welcome back. [00:03:00] Now, I wanna start today's episode a little differently because I have to tell you about my weekend. I was at the ACNEM conference this weekend just gone. That's the Australasian College of Nutritional and Environmental Medicine. And I have to say, I came home buzzing. Like, I saw so many beautiful familiar faces, including Amanda, my beautiful naturopath and mentor who I've known for many, many years, plus other colleagues I've known for years and only ever get to see at events like this one.

I also made some new friends too, other practitioners doing extraordinary work in their own corners of women's health who I cannot wait to stay in touch with. There is something about being in a room full of clinicians who are all obsessed with getting the science right, who all care this much about their patients, that fills my cup in a very big way.

I left feeling energized and also feeling a little emotional maybe

about how lucky I am to be part of this functional medicine health community. One presentation in particular has stayed with me since Saturday. A [00:04:00] naturopath named Rhiannon Hardingham gave a session called The Clinical Use of Soy in Hormonal Health: Mechanisms, Safety, and Translational Practice.

And it was hands down one of the most thorough, well-researched talks on soy isoflavones I have ever sat through. I was scribbling notes away the entire time, and at one point I turned to my beautiful colleague, Dr. Shari Trimble, who was sitting with me. She works with me in my online programs, and we went to this conference together.

And so I said to Shari, "My listeners need to hear this." And so here we are.

Because here's the thing, so many of you, like beautiful clients of mine and people in my community online, have sent me messages over the years asking me about alternatives to hormone replacement therapy, technically called menopause hormonal therapy rather than HRT. It's really MHT. But for understanding and ease of talk today, let's call it HRT.

So yeah, a lot of people have asked for alternatives to HRT, whether [00:05:00] that's because you've got a family or personal history that makes you feel like HRT is too risky for you, or because maybe you've tried it and it didn't agree with you, or because your doctor won't prescribe it for you, or simply because you'd rather try a food-based natural approach first before reaching for anything pharmaceutical.

And so soy isoflavones done properly with the right dose and the right understanding of the mechanism are actually one of the most researched and most clinically supported natural options we have. So today, I wanna walk you through exactly why, not as a blanket recommendation, but as a really usable information you can take into your own health decisions.

So as always, I wanna map out what we're covering today so you know what's coming. We're gonna start with why so many women are looking for alternatives to hormone replacement therapy in the first place. Then I'm gonna explain the actual mechanism, what soy isoflavones do in your body, and why that mechanism is so clever.

And we're gonna go through the evidence for hot flashes, sleep, [00:06:00] sexual function, mood and cognition, bone density, heart and liver health. And the one everyone always asks me about, cancer safety. Then we're gonna have a little chat also about endometriosis and inflammatory conditions, because there's some really exciting new research there too.

And I'm gonna explain a concept called equal production, which changes how effective soy is for you personally. And we're going to finish with exactly what to do, dose, food sources, and how to optimize your own results. So let's have a little think about why women go looking for alternatives. And I wanna start with a little patient story of mine.

So I'm gonna call this patient Marion, just for privacy reasons. I never use my clients' real names on this podcast. But Marion came to me, she was in her early 50s. She was deep in perimenopause, so hot flashes disrupting her sleep most night, and a level of brain fog that was making her [00:07:00] second-guess herself at work in front of people she'd managed for a decade.

Her GP had suggested HRT, but Marion had a first-degree family history of breast cancer. And even though it wasn't estrogen dominant or estrogen dependent, and she didn't have the BRCA1 gene, understandably she was terrified of adding any additional estrogen exposure to her body. So she felt really stuck, suffering through symptoms on one side, frightened of the treatment on the other, with nobody offering her, like, a middle path or a middle ground.

And Marion's not unusual. If you've got a personal or family history of hormone-sensitive cancer or a clotting disorder or a history of stroke or migraine with aura, or you simply do not wanna take a pharmaceutical hormone, you may not be a candidate for HRT, or you may just prefer not to be.

And if you've tried HRT and it has not agreed with you or your symptoms are being driven by conditions like [00:08:00] endometriosis or heavy bleeding where more estrogen exposure can make things worse

rather than better, you kind of need another option that's not just wait it out or get a hysterectomy. That is exactly the gap that well-researched soy isoflavone use can fill, and it is why I wanted this episode to be really thorough rather than just a quick surface-level overview. So let's go through the mechanism, why soy is so clever

We'll start with talking about what soy isoflavones actually are and why they work the way they do, because understanding the mechanism is what lets you trust the outcome. So soy isoflavones, often abbreviated as SIF or S-I-F in the research, are a type of phytoestrogen, meaning a plant compound that is structurally similar to estrogen.

But structurally similar does not mean identical, and that difference is everything. Soy isoflavones are [00:09:00] classified as S-E-R-M-S, SERMs, selective estrogen receptor modulators. Think of your estrogen receptors as locks and your own estradiol, your body's main estrogen, as the master key

that fits those locks perfectly and turns cleanly inside the lock. Soy isoflavones are like a spare key. A close enough shape to fit the same lock, but they turn it a little more gently, not quite so tightly and perfectly. And this is the clever part. How much they turn it depends entirely on what else is happening in your hormonal environment Your body has two main types of estrogen receptors, estrogen receptor alpha and estrogen receptor beta,

and they are not distributed evenly around your body. Think of it like a map. Estrogen receptor alpha is dominant in what we call [00:10:00] proliferative tissue, the uterus, and to a lesser extent, the breast and liver. Tissue that estrogen stimulates to grow and divide. Then estrogen receptor beta, by contrast, is spread across your brain, your cardiovascular system, your gastrointestinal tract, your urogenital tract, and your bone.

And within the brain specifically, it clusters in certain areas, the hippocampus, the frontal cortex, the amygdala, and the hippocampus. The exact regions of your brain involved in memory, mood, and temperature regulation, which is not a coincidence given what we're about to discuss with hot flushes and brain fog.

  soy isoflavones have a weak affinity for estrogen receptor alpha. Roughly 4% of what your own estradiol, your own estrogen has. But a much higher affinity for estrogen receptor beta, around 87%. And that [00:11:00] affinity for estrogen receptor beta actually doubles when your estrogen levels are low.

So when soy isoflavones bind mostly and strongly to estrogen receptor beta and only weakly to estrogen receptor alpha, you're getting the protective brain-supporting, bone-supporting, heart-supporting side of estrogen's actions without the meaningful switching on of the growth-stimulating side.

So that's the safety story just in one sentence. I'm gonna say it again

Because the soy isoflavones bind mostly to the estrogen receptor beta, you're getting the brain-supportive, the bone-supportive, the heart-supportive actions of estrogen without that growth-stimulating side. So remember that because we're going to come back to it properly when we talk about cancer. There is another layer to this that I find really elegant.[00:12:00]

Soy isoflavones behave differently depending on your own hormone levels. In a high estrogen environment, say if you're still cycling and estrogen is elevated in the first half of your cycle, isoflavones act as a mild antagonist, gently competing with your own estrogen and calming an overactive signal.

But in a low estrogen environment, like the post-menopausal years or the erratic troughs of perimenopause, they act as a mild agonist, propping up receptor activity where your own estrogen has dropped away.

Think of it less like an on-off switch and more like a dimmer switch that has read the room and adjusted itself accordingly up or down. That is precisely why isoflavones can help with symptoms across such a wide range of hormonal states, and why they are particularly well-suited to perimenopause when your own estrogen is not simply low, it is swinging, wobbling [00:13:00] predictably from very high to very low, sometimes within the same week

Alongside this receptor activity, isoflavones do several other useful things in the background. They mildly down-regulate an enzyme called aromatase, which converts testosterone into estrogen, and they down-regulate 5-alpha-reductase, the enzyme that converts testosterone into DHT, which is the more potent symptom-driving form of testosterone involved in things like acne and hair thinning.

They also stimulate your liver's production of sex hormone binding globulin, or SHBG. You might have heard of that before. It mops up excess bioavailable estrogen and testosterone, and they support your liver's phase one and phase two detox pathways, which are   exactly what you need for efficient hormone clearance. Now, none of these are dramatic headline effects on their own, but together they add up to a really supportive hormonal environment. [00:14:00] So let's chat about hot flushes, sleep, and sexual function, and let's get into what the research actually shows for the symptoms most of you are dealing with day-to-day when you get into those perimenopause years.

For vasomotor symptoms, which is hot flushes and night sweats, there is now a substantial body of randomized controlled trial evidence, and it consistently shows benefits over placebo. A meta-analysis published in the Journal of Menopause back in 2012, pooling data across multiple trials and hundreds of women, found a statistically significant reduction in hot flush frequency and severity with isoflavone supplementation compared to placebo.

More recent systematic reviews have continued to confirm this finding across somatic symptoms, headaches and migraines, plus palpitations, and what the research calls the musculoskeletal symptom of menopause, so the joint aches and stiffness

so many of you write off [00:15:00] as just getting older when it's often hormonally driven. The effect is not as dramatic as pharmaceutical menopause hormone therapy, and I wanna be honest with you about that rather than kind of oversell the soy thing to you. But it's real, and it's measurable, and for many women, it's enough to change the day-to-day life significantly

And I have to tell you, As soon as I sat through this lesson on the weekend, I went straight to the stand that sells soy isoflavones, and I asked for a bottle, and I've got one, and I started taking them that day. But another area that I found particularly compelling was the newer research on sexual function.

A systematic review and meta-analysis published in the International Journal of Impotence Research in 2026, so it's really recent, pulled 13 randomized controlled trials over 1,300 women comparing soy isoflavone doses of 40 to 160 milligrams a day against placebo or hormonal therapy.

Vaginal dryness improved [00:16:00] significantly, and the size of that improvement was large, not just small and marginal. For any of you who've been told that The only answer to vaginal dryness is topical or systemic hormones, it's really worth knowing about

There is also good evidence for skin changes associated with menopause specifically. A trial published in Nutrients found that soy protein containing isoflavones measurably improved facial signs of photoaging and skin hydration in post-menopausal women. Which makes sense once you know that estrogen receptors are present in skin tissue too, and that collagen production drops sharply as your own estrogen declines.

Now, let's talk about the mood and cognition piece or the brain connection. So I wanna go a little deeper on something that I don't think gets talked about nearly enough, and that's the effect of soy isoflavones on your brain. This research actually goes back over two decades

With the first reports on cognitive benefits published in 2021. [00:17:00] But the piece I wanna focus on is more recent and more rigorous. So a landmark systematic review and meta-analysis published in Nutrition Reviews in 2020 pulled together 16 randomized control trials, nearly 1,400 participants with an average age of 60, and found that soy isoflavones

significantly improved overall cognitive function and memory compared to placebo. I want to be precise with you here because I promised you the real numbers, not vague reassurance.

So the effect sizes in that study were modest, but they were statistically significant, meaning this was not just noise, this was a real measurable benefit. And interestingly, the authors of that review raised the idea that there may be a critical window of opportunity for starting isoflavone use earlier

Rather than waiting years into post-menopause, particularly when it comes to protecting cognition long term, which is a very compelling argument for thinking about this proactively in perimenopause [00:18:00] rather than just reactively once these symptoms are really already entrenched So why would a hormone-modulating plant compound affect memory and mood this way?

Because estrogen receptor beta, remember? The receptor that soy isoflavones preferentially bind to. Well, that estrogen receptor beta is heavily concentrated in the areas of your brain responsible for memory, mood regulation, and executive function, including the hippocampus and the frontal cortex.

So isoflavones can cross the blood-brain barrier, and once there, they reduce oxidative stress in brain tissue. They support the structure of nerve cell membranes and increase dendrite density, which is essentially the wiring density between your brain cells, optimizing how well signals travel. And they help also regulate acetylcholine.

This is the neurotransmitter most closely tied to learning [00:19:00] and memory, and the same neurotransmitter system targeted by dementia medications. So there is even early evidence that isoflavones inhibit the phosphorylation of tau protein.

You might have heard of that before because that's the process implicated in the development of Alzheimer's disease. Though I do wanna flag that as an emerging mechanistic area of research rather than something proven to prevent dementia in humans, so just take that one with a grain of salt. But this is also where equol, which I'm gonna explain properly a little later in this episode, it's where equol becomes particularly relevant because equol crosses the blood-brain barrier even more readily than the parent isoflavones do.

Just hold tight for that one. I'm about to explain what that's all about. Now, heart, liver, and metabolic health. So let's move into this area that I think soy isoflavones deserve far more credit for, which is cardiometabolic and liver health. On the cardiovascular side, [00:20:00] isoflavones have been shown to lower total cholesterol, lower triglycerides, lower your LDLs, which is your bad cholesterol if we make it really simple, and raise your HDLs, your good cholesterol if we make that kind of simple too, and that's your protective cholesterol.

And they do that by inhibiting lipid production and supporting its metabolism. So a review published in Antioxidants Journal in 2021 summarized trial data showing that a daily intake of around 66 milligrams for six months of the soy isoflavones significantly reduced metabolic markers and systolic blood pressure, So blood pressure as well in menopausal women with modeled reduction, so they've modeled it out to a 10-year cardiovascular study, and they've modeled it out to this 10-year risk that it's kind of worth knowing about.

So the model shows a lower risk of coronary heart disease, a lower risk of heart attack, a lower risk of cardiovascular disease [00:21:00] overall, and of cardiovascular death. Separate research also has also found that around 60 milligrams a day is associated with reduced cardiovascular disease risk, and around 80 milligrams a day significantly reduces arterial stiffness.

So as you can see, the direction of the evidence is unambiguous. This is a heart-protective compound

On the metabolic side, soy isoflavones benefit pancreatic beta cell function and have been shown to lower fasting insulin, fasting glucose, and a marker called HOMA-IR, which reflects insulin resistance, improving blood glucose control and insulin sensitivity, specifically in post-menopausal women.

There's also been some research done on adipose tissue, which is fat tissue, showing isoflavones reduce visceral fat, lower circulating leptin, which is a hunger hormone,

and

Andrea: And increase the activity of adiponectin, or hormones secreted by fat cells that [00:22:00] helps protect against diabetes, along with promoting the conversion of white fat into metabolically active brown fat, which also increases energy expenditure. And then there's liver health, which almost never gets mentioned in conversations about menopause, but absolutely should.

So soy isoflavone intake has been associated with reduced rates of both alcoholic and non-alcoholic fatty liver disease, along with reductions in some liver enzymes, mainly ALT and AST. So these are two of the liver enzymes that we measure on standard liver function tests to check for liver stress or liver health.

Isoflavones also support glutathione peroxidase activity, two of your body's most important internal antioxidant systems. Particularly relevant given how much additional metabolic work your liver is doing to clear hormones during the menopause transition

Now, bone density with soy isoflavones is something I'm really interested to know about. And if you've heard [00:23:00] some of my other podcast episodes before, you'll know that my mom suffers from osteoporosis, and I do not want to. So a meta-analysis published in 2022, pulling 11 randomized controlled trials and over 1,200 women, so it's a big number, found that a daily intake averaging 82 milligrams of the soy isoflavones, ranging from 47 to 150 milligrams taken for six to 12 months, produced a statistically significant increase in lumbar spine bone mineral density, along with a reduction in fracture risk.

So if you've had a DEXA scan, like some of you know I have had recently, and your bone density is not where you want those numbers to be, This is an approach that is absolutely worth discussing with your practitioner as part of a broader bone protective strategy, alongside resistance training, of course, and adequate protein.

Which brings me to one more small but useful point. When soy [00:24:00] proteins are eaten in place of other legumes or grains, they tend to increase your overall protein intake. And when eaten in place of animal protein, they tend to increase your fiber intake. So two quiet wins layered on top of everything else

 

Andrea: Okay. It's time for the [00:25:00] cancer chat, so we wanna address this properly. I know some of you have been waiting for this section, of course, today, ever since the moment I said the word soy. So let's deal with it properly because half-truths on this topic have caused real fear for a lot of women.

Okay. Here's the concern in its simplest form. If soy isoflavones can act like estrogen, and estrogen can drive hormone-sensitive cancers, does soy increase cancer risk? The research says no, and I wanna talk you through why, because the mechanism actually matters here. Remember earlier when I explained soy isoflavones have very weak affinity for estrogen receptor alpha, the proliferative receptor dominant in breast and uterine tissue at roughly 4% of what your own estradiol strength does?

Well, a 2009 study published in Nutrition and Cancer found [00:26:00] that the level of estrogen receptor alpha   Activation required to meaningfully stimulate proliferative tissue growth has never been demonstrated in human studies of dietary isoflavone intake, not once. To get anywhere near that level of activation would require plasma concentrations around 10 times higher than what is achieved even on a very high soy isoflavone diet.

Some activation has been shown in isolated cell studies in a lab dish, but even those researchers concluded that overall benefits outweigh any theoretical risk

Now let's look at the population level data, because this is where it gets really reassuring. A meta-analysis published in, Invivo in 2022 Concluded that higher soy isoflavone consumption was associated with a lower likelihood of breast cancer diagnosis, and better outcomes for women already diagnosed.

And a much [00:27:00] larger systematic review published in Frontiers in Nutrition in 2022, pooling 81 separate studies, found a dose-dependent reduction in cancer incidence across the board.

So overall cancer risk was around ten percent lower with higher isoflavone intake. And for every additional ten milligrams of isoflavones consumed per day, risk dropped by a further four percent. That same review looked specifically at gastric, breast, prostate, colorectal, endometrial, ovarian, and lung cancers, and found reduced risk associated with isoflavone intake across most of these individually, not just in, like, the pooled total.

Interestingly, the same review Found no significant protective association for soy protein taken on its own, which tells us something important. It is specifically the isoflavone content of the soy, the isoflavone part [00:28:00] doing the protective work, not soy protein in general.

And that distinction matters when you are choosing what type of soy product to reach for. For those of you who have had breast cancer yourselves or are currently in treatment, the research specifically looking at this group is reassuring too. Isoflavone consumption before diagnosis is linked to reduced risk of reoccurrence and mortality.

And consumption after diagnosis has not been shown to increase risk, with specific benefit actually noted for post-menopausal women in particular. Now, this does not, listen clearly, it does not replace a conversation with your oncologist, and I would never suggest it should. But it should mean you are not carrying unnecessary fear about a plate of edamame beans or a bowl of miso soup

Now, the next piece of research I wanna share with you is one I found really [00:29:00] exciting, because it applies to a group of women who are so often left out of the hormone conversations entirely. And that is those of you dealing with endometriosis, adenomyosis, fibroids, or heavy menstrual bleeding, where standard estrogen-promoting interventions can actually make things worse.

In 2025, an analysis drawing on the Nurses' Health Study Number 2, over 82,000 women followed from their late 20s and 30s right through to their 50s, with soy intake tracked every four years for three decades, found that women eating three or more servings of soy foods a week had roughly a 30% lower risk of developing laparoscopically confirmed endometriosis compared to women who ate none.

The researchers also found that higher soy intake was linked to a lower likelihood of ever experiencing infertility. Maybe I should've been eating more soy when I was trying to go through my [00:30:00] fertility journey. Anyway. But these researchers hypothesized that soy may be particularly helpful for endometriosis-related pain specifically.

As the study authors themselves noted, if this finding holds up in further research, it points to something worth taking seriously, a genuinely simple, low-cost dietary change that could significantly reduce a woman's risk of a condition that currently has very few prevention strategies at all.

And this fits with what we know about soy's broader anti-inflammatory action. So isoflavones inhibit the inflammatory mediators triggered by cytokines. The cytokines, remember from previous episodes, they're the chemical messenger molecules your immune system releases when it is activated.

And that anti-inflammatory action shows up clinically in obesity-related inflammation, insulin resistance, [00:31:00] and autoimmune conditions such as rheumatoid arthritis, that tend to flare as estrogen drops. For those of you managing heavy menstrual bleeding, endometriosis, adenomyosis, or fibroids, where your practitioner may be understandably cautious about estrogen-promoting interventions, this anti-inflammatory receptor selective action gives you a really useful middle ground worth discussing with them

Now I want to explain a concept that changes everything about how well soy isoflavones work for you personally, and it's one of the most really interesting things that I learned this past weekend. When you eat soy, your gut bacteria gets involved before your body can use it properly. The same with most foods, of course.

And then in our small intestines, fermented soy products, things like miso and tempeh, they're already fermented, are largely already broken down into a compound which is ready for absorption. But we have then non-fermented soy products, and they travel further [00:32:00] down, down into your colon, where a completely different population of bacteria takes over.

So think of your gut microbiome as a chef, and the broken-down parts of soy as the raw ingredients handed to that chef. Through a multi-step chain of bacterial enzymes, some of that soy compound gets converted step by step through intermediate compounds   With names like

dihydrodaidzein and tetrahydrodaidzein into a final compound called equol, which is much easier to say than those other two names. And equol is dramatically more powerful than the initial broken down compounds of soy itself. So comparing one of those initial broken down

compounds genistein, one of the two main isoflavones you get straight from food or supplements against E2. So when we're comparing those side by side, genistein is easy for your body to access, absorbed directly through the diet or supplements, and [00:33:00] metabolized early in the small intestine.

Whereas compared to equol, it's much harder one, relying on that multi-stage colonic fermentation process that I just described. But where equol wins is potency. Equol has somewhere between 80 and 20 times greater affinity for the estrogen receptor beta than those initial broken-down soy compound doses.

They've got higher bioavailability, stronger antioxidant activity, better bone protection, and better ability to cross the blood-brain barrier than those initially broken-down soy compounds. However, not everyone can make this conversion into equol. Roughly 50 to 60% of people in Asian populations are equol producers

compared with only about 25 to 30% in Western populations. Though interestingly, Western vegetarians [00:34:00] come back up to around 50 to 60% too. And equol producers consistently experience greater benefits from soy across the board, so better relief of acute menopause symptoms, better long-term cardiovascular and lipid profiles, better cognitive outcomes, even better premenstrual symptom control.

But here's the really empowering part. Whether or not you are currently an equol producer is not fixed. It can be changed. And research shows that a higher fiber intake and regular ongoing soy consumption over time can increase your capacity to produce equol, kind of essentially training your gut microbiome towards a more favorable composition.

So this is not a lottery you can either win or lose. It's something you can actively work on, and it is one of the reasons I am such a broken record about fiber intake with every single one of you. Now, let's turn this into action because information without application [00:35:00] does not change anything for you.

So I've got four steps for you. Step one, choose whole soy foods over isolated soy protein. Don't have the isolated soy protein, only whole soy foods. So tempeh, tofu, edamame, miso, natto. They all retain their Natural isoflavone content at roughly three and a half milligrams of isoflavones per gram of soy protein. Soy protein isolate, by contrast, has much of that isoflavone content stripped out of it in processing.

So think of soy protein isolate like a piece of fruit that's had all of its juice squeezed out and then the pulp thrown away, and you're left with just the protein, but very little of what actually made the whole food valuable. Then step two, if you're using a supplement, know that clinical trials in this research have used doses ranging from 30 to 180 milligrams a [00:36:00] day, with most standard capsules delivering around 60 milligrams.

The studies showing the benefits for hot flushes, bone density, and cardiovascular markers, those studies have the dose generally sitting in the 60 to 80 milligram range, taken consistently for at least three to six months before you assess whether it's working for you.

So this is not a compound that gives you an answer in a week. Patience definitely matters here, and I would rather you commit properly to a three-month trial than just, I don't know, judge it after 10 days and then give up too early saying, "Doesn't work for me."

Then step three, support your gut microbiome diversity. Everything comes back to the gut. It's so important to support this diversity because that is what determines how well you convert those isoflavones into their most active forms, including equol. A high-fiber, diverse plant, so plant-diverse diet is doing more for your hormone symptoms than you might realize.[00:37:00]

And if antibiotics have been a recent part of your health history, know that they can temporarily reduce your plasma isoflavone concentration. So it may be worth giving your gut some extra support and a little more time during that period before you judge any results from these supplements working or not.

And then step four, if you have a history of hormone-sensitive cancer, a clotting disorder, or any complex medical history, please have a conversation with a qualified practitioner who knows your full picture before you start any supplementation with soy isoflavones. Everything I have shared today is really reassuring at a population level, but your individual case deserves individual advice, and that is not me covering myself.

That's just simply good medicine. So to summarize those steps, choose whole soy foods over isolated protein. Dose consistently in the sixty to eighty-milligram range if supplementing, and give it three [00:38:00] to six months. Support your gut microbiome for better equol conversion.

And always personalize this with a practitioner if your history is complex. If you decide to bring more soy into your life, be patient with the timeline. Vasomotor symptoms like those hot sweats and night flashes typically take several weeks to months to shift. Bone density and cardiovascular markers are measured in the studies over six to twelve months, not just days.

So this isn't a quick fix. It is a steady, cumulative, food-based strategy, and that is exactly why I love it. It works with your body's own systems rather than overriding them I think about Marion, the patient I mentioned earlier. We built her a plan around whole and fermented soy foods alongside the other pillars we always work through together with my clients, inflammation, gut health, nervous system support.

And for her, the [00:39:00] results weren't overnight, but three months in, her sleep had improved, her hot flushes were less frequent and less intense. And for the first time in a long while, she felt like she had a kind of some real options that did not require her to sit with fear every time she took it.

And that is what I want for every single one of you listening today. Not a miracle, but a real evidence-backed option that finally feels like it fits. So if you want structured support building an approach like this into your own life, this is exactly the kind of work we do inside my programs.

You can find more information at andrearobertson.health. So please hit subscribe or follow the show on whatever platform you're listening on right now, because you do not wanna miss a single episode. And if someone in your life needs to hear this, please share it with them too, because the more women who have access to this kind of information, the better.

Just a little note, all of my free resources, my three-week [00:40:00] inflammation detox, and my 12-week whole health solution can be found at andrearobertson.health. Everything you need is right there waiting for you. If you've loved today's episode, please, please, please take 30 seconds to leave a review on Apple Podcasts, Spotify, YouTube, or wherever you listen to your podcasts.

It really does help more women find the show so they can nourish, heal, and rise too. Until next week, nourish your body, keep healing, and never stop rising. I'm Dr. Andrea Robertson, and this has been Nourish, Heal, and Rise

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