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Dr. Stacy Sims: Why She Can't Lose Weight Eating Like Her Husband

Dr. Stacy Sims Official

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Why aren’t you losing weight in perimenopause or menopause even when you eat and train like your male partner? This clip explores how female physiology, circadian rhythm, and hormone pulses can make the same fasting and workout approach work for men but leave women tired, hungrier later, and sleeping worse. Stacy Sims breaks down cortisol awakening response, appetite hormone regulation, melatonin timing, and why delaying food can disrupt sleep and metabolic control. She also explains how high-intensity exercise can drive epigenetic changes that improve glucose control, plus why protein, fiber, food quality, and timing matter more than calories alone.

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I’m Dr. Stacy Sims, exercise physiologist, nutrition scientist, and author of ROAR and Next Level. My mission is simple: stop training women like small men. I help you understand and work with your physiology - for better performance, health, and longevity.

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17 Comments

@lucycartwright9053 1 month ago

I've always put off eating breakfast to save my calories for later, and intermittent fasting seemed to work for me... but I always felt too tired to exercise, and if I pushed myself to train then I'd often end up overwhelmingly exhausted and collapsed afterwards. A few months ago I started eating bigger breakfasts regularly and the difference is amazing. I feel more resourced all day, feel the inclination to go for little walks, have energy to train in the afternoon and I actually eat less at night as I'm not so hungry. I'm also maintaining a lower body fat whilst eating more calories than I'd expect. I'm a 51 year old woman. My best friend is a 43 year old (and highly muscled) man. He can basically eat nothing all day, work a highly physical job and then eat one giant meal in the evening and is completely ripped. Testosterone is a hell of a drug.

@melaniepare2609 1 month ago

Best doctors on this topic together !!! 🎉 thank you so much!

@introvert-paradox 1 month ago

Thank you, thank you, thank you for communicating this, for educating us. ❤❤❤❤❤

@JuliaCantley 1 month ago

Gah being a woman and just basic living is so complicated.

@Sandyshopping-jr6bu 3 weeks ago (edited)

2 amazing wonderful women who are passionate about women’s health and fitness, thank you ladies ❤

@ele5431 1 month ago

Grazie ❤

@MarcosBarcala-v2c 1 month ago

When you give timeframes related to the circadian cycles, are you basing it on a particular waking time? I have the understanding that the circadian cycles depend not only on the clock time but also when the person goes to sleep and wakes up, it's my understanding wrong?

@Flyniganshenanigans 1 month ago

Yeap… I’m doing all these bad things. This is gonna be tough to fix.

@liabell2175 1 month ago

Dr. Sims, you've helped me tremendously. I had a severe illness, house/bedbound for 3 years, coinciding with menopause - and when I finally got better, just could not rebuild strength and fitness. Your precise, female-biology-based information gave me the keys I needed to get healthier & stronger in a body that is different from what I knew before illness & menopause. I'm well on my way now, and very grateful to you.

@tikvahott9403 1 month ago

So if I wake up at 3 am and can't go back to sleep, do I need to eat, or is this only within 30 minutes of your target wake time?

@plaru5194 1 month ago

What are you supposed to do at 9pm then, To not miss the rise in melatonin? How does sitting on the couch cause you to miss it? And don’t say go to bed, because that doesn’t work.

@LAF2022 1 month ago

I lift weights 3 days a week. I increase my weights as I notice it feels easier. For example, I am about to move from 15 pound dumbbells to 20 pounds for biceps, chest press , etc. I do cardio three days a week which includes walking, 20 pound weighted vest, stationary bike, jog, and HIIT. I take one day off with just light dog walking. I move around throughout the day and get between 10,000 to 15,000 steps. I get 7-8 hours of sleep. I wake up at 5 AM, walk at 5:30 AM, workout at 6:00 AM, eat breakfast at 8 AM. I walk for 5-10 minutes after eating each meal. I eat between 1600-2200 calories each day. I get 90-120 grams of protein. I am 46 years. My weight is going up. I am at an average of 140 pounds with body fat between 25-26. I am not seeing any change no matter what I do. I really want to tone. What am I doing wrong?

@RedPandaCookie 1 month ago

Can you share sources for the claims made in this video?

@rruttinger5877 1 month ago

I gained 15 of the 25 pounds I lost once I tried following this 😢

@vanessabrass8926 1 month ago

The thumbnail picture of the Woman irritates me. Do you think she has to loose weight? To me she seems muscular and Not Like she has problematic bodyfat

@Canny-Octopus 1 month ago

That’s hilarious that your “omg sOoOo fat” woman thumbnail is a very healthy athletic woman. Wait, no, I mean sad.

@liabell2175 1 month ago

This is a great short video: information-dense, not dumbed-down yet very accessible - I'll share it widely! Thank you for the amazing work you do, and especially for communicating it so well & getting it out there for women 🙂