The Body Reset: How Women Should Eat & Exercise for Health, Fat Loss, & Energy

High-Level Overview

Mel Robbins opens with a confession: after this conversation, she realized she's been exercising wrong for 40 years and feels gaslit by bro science. Her guest is Dr. Stacy Sims, an exercise physiologist and nutrition scientist with a PhD, faculty roles at Stanford and Auckland University of Technology, 107 peer-reviewed papers and the books ROAR and Next Level. Sims's mantra is "women are not small men": from the womb onward, women's physiology differs, yet most fitness and nutrition advice is drawn from research on men and simply applied to women, an approach the industry calls "shrink and pink."

Together they walk through the mistakes women make by following male-centric advice: fasted workouts, intermittent fasting that holds out until noon, endless cardio, light weights with high reps, ice-cold plunges and "abs are made in the kitchen" dieting. Sims replaces them with practical, science-based alternatives: eat something before moving in the morning, get about 30 grams of protein early, lift heavier with fewer reps, do very short sprint intervals, use cooler rather than icy water, use the sauna, and consider creatine. The tone is energetic, funny and indignant, with Mel reacting in real time (and drinking her first protein coffee), and the conversation moves from morning nutrition to the science of exercise as stress, to specific training protocols by age, to listener questions and body positivity.

The Discussion Explores:

• Why "women are not small men" and how research on men has been generalized to women
• Why fasted training and late intermittent fasting backfire for women, and why to eat soon after waking
• The protein coffee hack and splitting breakfast to hit 30 grams of protein
• Exercise as a positive stress that builds stress resilience, and why diet trends miss the point
• Strength training for muscle, bone and brain, with shorter rest periods suited to women
• Sprint interval training and heavier, lower-rep lifting from the mid-30s onward
• Cold plunges, saunas, pre-workout protein and creatine for women
• Getting started without intimidation, and building body positivity

Deep Dive into Main Ideas

Women Are Not Small Men

Sims says the phrase began as a way to wake up sleepy Stanford undergraduates, but it captures a serious point: everything from development in utero to aging differs between the sexes, yet guidelines for exercise, nutrition and even mental health are mostly drawn from men and generalized to women. She describes the industry practice of "shrink and pink," making a running shoe or bicycle smaller and pink and calling it a women's product. Her advice is to pause whenever a new fitness trend appears and ask where the data came from and whether it fits you as a woman at your stage of life.

She says women who follow the same program as their male partners often end up "tired but wired": after four weeks the man is leaner and fitter, while the woman feels fatter, tired and no fitter. She also says women who take care of their bodies tend to become more empowered, gain better body positivity and gain some separation from stress, and she credits exercise and strength for helping her navigate male-dominated environments.

Stop Training on an Empty Stomach

The first big mistake is fasted training, exercising without eating. Mel realizes this is exactly what she and her husband Chris have done, with him getting results while she felt "puffier and fluffier" and tired. Sims says "Women's bodies don't respond well to fasted training." Women's brains, especially the hypothalamus, are highly sensitive to blood sugar and food. Exercising without fuel is treated as a stress, and one of the first things the body breaks down for fuel is muscle.

She explains that about half an hour after waking, women have a spike in cortisol, the stress hormone. Food signals the brain to bring it down; without food, women stay in a heightened stress state, chewing into lean mass (muscle and bone) and holding onto body fat, particularly as they age. She notes men have more glucose-using muscle fibers, so fasted training can push their muscles to adapt to burn more fat, while women already have more fat-burning oxidative fibers and different brain feedback, so the same approach backfires. Newer circadian research, she says, shows metabolic benefits for people who break their fast around 8 a.m. and stop eating by 6 p.m., but not for those who hold a fast until noon or later.

The fix is small: even before a walk, have a little fuel, such as a protein coffee, a couple of tablespoons of yogurt or half a banana. She compares exercising on empty to revving a car on the highway with the tank on E. Many women at a recent competition told her eating beforehand changed their training and energy. Front-loading calories and lowering baseline cortisol also improves sleep, and she says many women's night awakenings are due to low blood sugar from under-eating.

Protein Coffee and a Split Breakfast

Sims isn't hungry in the morning either, so each night she mixes protein powder into almond milk, adds a double espresso and refrigerates it, giving her about 30 grams of protein and caffeine that tastes like a latte. Mel, drinking one in the studio, says it tastes like a milkshake and solves her struggle of getting 30 grams of protein in the morning without choking down egg whites.

For a busy, plant-leaning mother of three who is never hungry at breakfast, Sims suggests overnight oats with chia, split in two: half on waking with berries and a tablespoon of Greek yogurt, then a walk, home workout or even 15 minutes of breath work, then the second half with more yogurt, nuts and berries, adding up to about 30 grams of protein over a couple of hours. Within a couple of weeks, she says, appetite and circadian rhythm reset, sleep improves and body composition starts to change.

Skinny Fat, Visceral Fat and Why Eating More Can Help

Sims warns that women over 40 who do lots of cardio and under-eat often become "skinny fat: lean-looking but with little quality muscle, fat marbled within muscle and bones like chalk." DEXA scans (whole-body scans of muscle, fat and bone density) of women proud of their fasting and coffee-until-noon routines can reveal low bone density, more visceral belly fat, worse cholesterol, more inflammation and insulin resistance. From the late 30s, women also get a hormonal signal to store more visceral fat. Mel sums up the paradigm shift: you may need to eat more to lose fat, the opposite of what women have been told for decades.

Listener Ruby asks why some people look toned and others don't despite effort. Sims explains body types (mesomorphic, endomorphic and ectomorphic, with most people a mix) and says results depend on training and eating. She notes her sister, never athletic, changed her body composition through a year of strength training after overcoming fear of the number on the scale. Unless you're genetically predisposed, she says, it's very hard for women to get bulky, and under-eating or excessive cardio makes it even harder to build muscle.

Exercise as Stress, and Why Diets Miss the Point

Sims argues that diet trends like plant-based, carnivore, keto and intermittent fasting are attempts to achieve health outcomes that exercise itself delivers. Our environment removes movement, contributing to widespread obesity. If you return to normal eating, meaning breakfast, lunch and dinner, no snacks after dinner and mostly nutrient-dense, unprocessed food (what Mel calls the grandparent diet), and add exercise, you get the benefits. "Because exercise is a stress, the body is very adaptable to stress": a hard hill walk becomes easy in a few weeks because your body adapts.

Mel calls this an epiphany: exercise is intentionally stressing your body so it gets better at handling stress. Sims agrees: "It's a stress resilience." That resilience carries over to a tense work meeting, your immune system, and not snapping at your kids. She adds that walking, especially in green spaces, triggers a strong calming parasympathetic response, and that lack of movement, nature and community contributes to widespread stress and depression. Her goal is to explain exercise as a positive stress that changes everything from the central nervous system to individual cells.

Strength Training: Muscle, Bone and Brain

Muscle loss starts around age 30. Strength training preserves muscle, loads bone to improve its density, and, Sims emphasizes, protects the brain: it improves brain metabolism and neuroplasticity, reducing the risk of cognitive decline, which differs between the sexes. She jokes she'll be racing Zimmer frames (walkers) at 100 with a sound mind.

Because women's muscles are more fatigue-resistant, they need less rest between sets. In a five-by-five program (five reps of a squat, five sets, starting a new set every three minutes), men gain more relative strength than women, but if women start a new set every two minutes instead, their gains match. That means more training stress in less time. She also says "abs are built in the kitchen" works for men who cut alcohol and sugar, but women who cut calories without replacing them fall into low energy availability, so the hypothalamus holds on. Women should eat enough and build their core through compound lifts like deadlifts and squats rather than endless crunches, since their center of gravity is in the hips.

Bare Minimums, Sprint Intervals and Lifting Heavy After 35

In your 20s, the minimum is a couple of days a week of mixed strength and aerobic work, such as a twice-weekly full-body circuit. At home she suggests every minute on the minute: after a five-minute warm-up, do a minute each of jumping lunges, push-ups, an overhead press and air squats, then rest a minute, repeating the circuit two or three times with no equipment needed.

Walking with a friend is great for blood glucose, stress resilience and connection. For the heart, she recommends sprint interval training: 30 seconds or less as hard as you can go (running, cycling, kettlebell swings, air squats, jumping lunges), then a minute and a half to two minutes of full recovery, for no more than five rounds. Even two done properly counts. This strong stress causes muscles to release signaling molecules that tell the body not to store visceral or subcutaneous fat, improve insulin sensitivity and improve blood vessel function and blood pressure. Sims herself mostly lifts three days a week and adds sprints, often at the end of a lifting session, spending 45 minutes to an hour in the gym.

In your 20s and early 30s, traditional protocols like 10 to 12 reps work. From the mid-30s, as estrogen and progesterone change, women need a stronger external stimulus: power-based training of about six to eight reps with two reps in reserve, meaning a weight heavy enough that you could manage only two more good reps. Mel realizes her little two-pound weights do nothing. But Sims cautions: learn to move first, start with body weight or a weighted backpack, follow good instruction, and build up over six to eight months to avoid injury. "It's not a training block. It's a lifestyle," aimed at being self-sufficient at 80 and 90.

Machines, Free Weights and Getting Started Without Intimidation

Listener Erin asks about machines versus free weights. Sims says machines are designed for men around 5 foot 8 to 6 feet and 160 to 190 pounds, so they often fit women poorly, though they can be a low-injury way to begin; she credits gyms like Planet Fitness for making lifting accessible. She prefers dumbbells and barbells, which use stabilizing muscles and mimic real life, like lifting groceries overhead.

Even she sometimes feels intimidated in male-dominated gyms, where front desks steer women to cardio machines and men to the lifting platforms at the back. She says two things help women thrive: knowing what to do and community. She suggests online resources at different levels, from basic guided home programs to app-based gym programs with progressive overload to CrossFit-style barbell training, and above all grabbing a friend. Her 12-year-old daughter came home from a gym session with a friend thrilled at how fun it was, and Sims calls the gym an adult playground.

Cold Plunges, Saunas, Protein and Creatine

Women don't need ice-cold plunges. Sims says ice water provokes a much stronger stress response in women, who clamp down with vasoconstriction but often don't shiver, and shivering is what drives the metabolic benefits. In water around 15 to 16 degrees Celsius (roughly 55 to 60 degrees Fahrenheit), women constrict and then shiver, getting the same responses men get from colder water: better stress resilience, insulin sensitivity, signals to lose deep body fat and cardiovascular benefits. Mel, who cuts ice off her barrel in Vermont and never shivers while her husband sits calmly, realizes she's been doing it wrong.

Women tolerate heat better, since they dilate blood vessels before sweating. For health, she suggests at least 10 to 15 minutes in the sauna twice a week, which triggers heat shock proteins and improves blood flow, blood pressure, glucose control, use of fat as fuel and tolerance of exercise heat. On meal timing: first thing in the morning, always eat before training; in the afternoon, if you ate within two hours, you don't need to, but eat afterward. Before strength sessions, research from Abbie Smith-Ryan at UNC supports about 15 grams of protein to boost post-exercise metabolism and training response.

Creatine isn't just for bodybuilders. Sims says women have about 70 to 80% of men's creatine stores, and supplementation benefits the brain, gut, heart, muscle and bone, mood and cognition in peri- and postmenopausal women, and is safe in pregnancy. The dose is three to five grams a day (about half a teaspoon), with no timing needed, and it takes about three weeks to saturate.

Busy Lives, Consistency and Body Positivity

For busy women, preparation beats perfection: protein coffee or overnight oats ready, non-perishable snacks like nuts, protein bars, shelf-stable almond milk and protein packets in the car or bag, fresh produce and whole grains at every meal for gut health, and shopping the perimeter of the grocery store rather than ultra-processed aisles. Her one takeaway is consistency: even 10 minutes a day just for you, whether mobility, stretching or squats and push-ups. "Make the kid playground the adult playground."

Her message for women to share with each other is body positivity and empowerment: "take up space. She wants every woman to feel entitled to the lifting platform at the back of the gym and, if someone looks at her funny, to pick up the barbell and say, I own this space." That confidence, she says, models strength for children and ripples outward into empathy and connection. Mel closes by saying she's changing how she and her daughters think about exercise: not acting like little men, but like powerful women.

Conclusion

Dr. Stacy Sims's core message is that women have been following advice designed for men, and it often backfires. The fixes are simple and science-based: eat soon after waking and before any morning exercise, aim for about 30 grams of protein early (protein coffee makes it easy), treat exercise as a positive stress that builds resilience rather than a calorie burn, and prioritize strength training with shorter rests, heavier weights and fewer reps from the mid-30s onward, plus brief all-out sprint intervals. Use cooler rather than icy water, enjoy the sauna, consider creatine, eat enough, and build consistency and community. Above all, she wants women to stop chasing thinness and start owning their strength, health and space.

This is a summary of "The Body Reset: How Women Should Eat & Exercise for Health, Fat Loss, & Energy" from The Mel Robbins Podcast, giving you the GIST so you can decide if you want the REST. Listen to the full episode.