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A physician-researcher reveals that focusing on the quality and variety of protein sources, rather than just the quantity, is crucial for women over 40 struggling with weight loss despite following standard dietary guidelines.
When the free press comes under fire, HuffPost doesn't back down. Stand with independent journalism — become a member today. Diane sat across from me looking like someone who’d done everything right and gotten nothing for it.
She was 58, and she’d spent three months following the advice that’s everywhere right now. The headlines, the wellness accounts, this year’s new federal dietary guidelines, which single out women over 40 by name: Eat more protein. She’d taken it seriously, on her own initiative, before we’d ever discussed it — Greek yogurt at breakfast, a chicken breast at lunch, a protein shake most afternoons, salmon or steak most nights. She’d started lifting twice a week.
She brought a food diary to the visit, unprompted, because she wanted me to see she wasn’t lying to either of us. Her weight hadn’t moved. Not up, not down. It was just stuck, in a way that made her start to wonder, quietly, whether something was actually wrong with her.
I’m a physician-researcher. I run randomized clinical trials on diet and metabolic health, and I’d watched this same protein message spread through my patient population for months without ever pushing back on it. It’s advice I don’t think is wrong, exactly, in the broad strokes.
But sitting across from Diane, watching her go through that food diary meal by meal, waiting for me to find the thing she’d done wrong, I realized that nobody had asked her a simple but impactful question: not how much protein are you eating, but where is it coming from? We went through the diary together. Her protein intake wasn’t just adequate, it was generous, comfortably above what the guidelines call for.
Nearly all of it, though, came from the same handful of sources: dairy, poultry, red meat, whey. Almost none of it came from beans, lentils, soy, or whole grains. Nobody had ever asked her to think about the split. That gap bothered me enough that I went back to our own team’s data that week, and what I found there was amazing.
A few years ago, our team ran ain postmenopausal women dealing with frequent, disruptive hot flashes. One group switched to a low-fat, plant-based diet that included a half-cup of cooked soybeans a day. The other group changed nothing. Total protein intake in the plant-based group barely moved, but what shifted was the source: instead of animal protein, protein from plant foods.
The results were bigger than we’d expected from a diet change alone. Moderate-to-severe hot flashes dropped 88% in the plant-based group, compared with about 34% in the control group. By week 12, roughly half the women who’d made the swap had no moderate-to-severe hot flashes left at all.
In aof that same trial, eating about 16 fewer grams of animal protein and 13 more grams of plant protein each day was associated with a weight loss of about one kilogram, or two pounds, without anyone counting a calorie or trying to lose weight on purpose. , followed for decades, found the same pattern at a population level: People who got more of their protein from plants and less from animal sources had a meaningfully lower risk of dying of any cause, heart disease included, over the following years.
And a, run by an entirely different group of researchers, found that plant-based, soy-based therapies specifically reduced how often women experienced hot flashes. What I’d found in Diane’s food diary wasn’t a fluke. It was the same signal other research teams kept finding too. At Diane’s next visit, I didn’t tell her to eat less.
I told her to eat differently. Swap the ground beef in a bolognese for lentils. Trade dairy for tofu or soy milk. Skip the protein bar and reach for a bowl of lentil soup instead.
Add a serving of edamame to a few lunches a week, instead of leaning on eggs and sausage. I simply asked her to shift a grocery list, one meal at a time, in a direction she’d never been pointed toward before. She was skeptical. I remember her saying, “I already eat a lot of protein, I don’t understand how eating different protein is the answer when eating more of it wasn’t.
” I told her honestly that I understood the skepticism, because I’d witnessed the same reaction to my own advice many times. She came back eight weeks later. Her weight was down a little, not dramatically, but for the first time in months it had actually moved. Her hot flashes, which she hadn’t even brought up as a concern at the first visit, had noticeably eased.
She told me she felt less foggy in the afternoons, which I hadn’t promised her, though it tracks with what I’d expect from swapping out foods that are fatty and spike and crash blood sugar for ones that don’t. She’d made maybe a few changes to her week routine. Nothing about her life looked dramatically different. Her metabolism, evidently, had noticed anyway.
I think about that first visit with Diane, because it wasn’t really her failure sitting in that chair. It was a gap in the advice she’d been given. The federal guidelines lean into protein harder this year than any version before them, and the part of that guidance that got real scrutiny, the friendlier stance on red meat and full-fat dairy, drew pushback from cardiology groups almost immediately. The protein-quantity push didn’t get that same scrutiny.
It fit the cultural moment too well, and it sailed through unchallenged. I don’t think the guidelines are wrong that protein matters, especially for women over 40 managing muscle loss alongside menopause. I think they’re incomplete in a way that’s easy to miss precisely because “eat more protein” is such satisfying, simple advice to give and to follow.
Twenty grams from a ribeye and 20 grams from lentils are not the same instruction to a body going through this particular transition. I don’t ask patients how much protein they’re eating. I ask where it’s coming from. It’s a smaller question than it sounds like it should be, and it is, so far, the one that’s actually moved something for the women sitting across from me, Diane included.
Hana Kahleova, M.D., Ph. D., is a physician board-certified in internal medicine, endocrinology and lifestyle medicine, and director of clinical research at the Physicians Committee for Responsible Medicine, where she runs randomized clinical trials on diet, menopause, and metabolic health, published in journals including Menopause, Diabetologia, and JAMA Network Open. Do you have a compelling personal story you’d like to see published on HuffPost? Find out what we’re looking for
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