Dr. Stacy Sims: How Women Should Train, Eat & Recover for Long-Term Health | The Best of 2025

Stacy debunks the 'cardio for weight loss' myth with concrete calories: one mile of running equals 100 calories, which is less than three Thin Mint cookies. She notes that even elite endurance athletes can have poor gut health and metabolic profiles if their diet is high in processed carbohydrates and sugars, despite massive calorie burns. She introduces the 80/20 or 90/10 rule as a sustainability framework: most of the time, eat quality protein and vegetables according to circadian rhythms, do strength work, sleep well; allow a small window for indulgences. If weight isn't moving, the first thing to cut is alcohol. The goal is 'recomposition', not just scale weight loss, because building muscle increases metabolic health and functional capacity.

Stacy acknowledges GLP-1s as transformative for those with metabolic disorders, PCOS, and chronic obesity who have struggled with lifestyle-only interventions. The problem is the widespread prescription via app without education. In her practice, patients receive an hour-long consultation covering risks, must commit to strength training, and are monitored with DEXA scans. She gives concrete numbers: 10% muscle loss is the danger zone, beyond which she reduces the dose or stops the medication. She cites the example of the film 'Wall-E' — people becoming frail, floating figures — as the dystopian outcome of unguided GLP-1 use. The key is making it a medically-supervised journey, not a weight-loss shortcut.

Stacy dismantles the 'calories in, calories out' and 'fat-burning zone' myths, explaining that long-duration cardio raises baseline cortisol and a catabolic state. Instead, she prescribes a periodized schedule: Monday squat variation, Wednesday push-pull, Thursday posterior chain. Each session is short but intense — she describes her own 25-min front squat/hip thrust session. She emphasizes adequate rest between sets (no supersetting) to maintain load quality. The addition of true sprint intervals (battle ropes, kettlebell swings, stair sprints) at the end of a session acts as a second stimulus without requiring a separate gym visit. Retraining means reducing volume, increasing intensity, and disconnecting exercise from calorie burn. The goal is not a 12-week transformation but sustainable strength that translates to daily life and longevity.

Stacy explains that for bone health, the body must absorb impact through the skeleton, not just the muscles. Traditional plyometric training teaches athletes to land softly with bent knees, which is excellent for joint protection and power development but leaves the bones under-stimulated. For women with osteopenia, the priority is generating sufficient ground reaction force. This means re-learning the jump: a small hop with a stiff, deliberate landing that creates a jarring sensation — multidirectional stress waves that tell the bone to lay down more mineral. She endorses Tracy Clissold's Osteo Gains app (10 min, 3x/week) as a structured, safe way to implement this, particularly for those who don't know how to program it themselves.

Stacy highlights a Bill Campbell study where sedentary women with normal weight obesity doubled their protein intake (from ~0.5g to 1.0-1.1g per pound) for 12 weeks and completely recomped their bodies, losing fat and gaining lean mass without adding exercise. This is powerful evidence that protein deficiency is a primary driver of 'skinny fat'. She notes that women’s nutrition has been dominated by carbs and fat wars, leaving protein out of the conversation. The RDA of 0.8g/kg is frequently misinterpreted as optimal when it's merely a floor. For active aging women, 1g per pound is a reasonable, effective target to support muscle and bone health. This is the first nutritional lever she pulls after sleep in her hierarchy of change.

Stacy directly contrasts the outdated bodybuilding approach — 20g/day in 5g doses with carbs, leading to bloating and water weight — with the health-oriented protocol. She explains that creatine is not just for muscles; it's vital for fast energy in the brain, heart, and gut. New research is expanding its role in mental health: two 5g doses daily helped severely sleep-deprived individuals and augmented antidepressants in treatment-resistant depression. She recommends the website creatineforhealth.com for women to access up-to-date, health-focused research. By starting with 1.5g and titrating up, women can avoid the nausea and bloating that come from jumping into high doses. The three-week saturation timeline is important for setting expectations — benefits accumulate gradually.

Stacy explains that the biggest fail in women's training is lack of recovery. Many women are stuck in a sympathetic, high-stress state from too much cardio and life stress. The key is not to avoid high intensity but to periodize it correctly and build in deliberate down-regulation. She debunks the cortisol-phobia around heavy lifting and HIIT, showing that when properly dosed, they actually increase growth hormone and testosterone, which shift the nervous system to parasympathetic mode post-exercise. Her personal practice is morning silence — absolute quiet with tea or coffee, just breathing, to set the day's baseline. She prefers L-theanine over magnesium for sleep because it directly affects the GABA system, unless one has access to magnesium threonate. This mind-body approach is the fourth pillar of her health change hierarchy (sleep, physical, nutrition, mind-body).

Stacy explains that as estrogen and progesterone drop, the hormonal environment no longer supports the muscle-building and recovery responses that metabolic stress (high reps, moderate loads) once elicited. Instead, women need an external stressor that mimics those hormonal effects — heavy loads that recruit the central nervous system and produce a powerful anabolic stimulus. This means reprogramming the mindset from 'cardio and light weights' to short, intense, heavy strength sessions. She emphasizes that this is not about bodybuilding aesthetics but about long-term health, bone density, and functional independence. The fear of injury is addressed by starting gradually: learning proper movement patterns with bodyweight, then adding load over 6–8 months. The overall message reframes strength training as a lifelong health imperative, not a temporary 'training block'.

Stacy acknowledges that GLP-1s are revolutionary for people with insulin resistance, PCOS, or chronic obesity who have failed with lifestyle alone. However, the danger lies in easy access without education. Because the drugs suppress appetite, total calorie intake drops, often leading to inadequate protein and micronutrients, accelerating muscle and bone loss. She details her clinic's protocol: an hour-long risk/benefit consultation, mandatory resistance training and protein targets, and regular body-composition scans using DEXA or similar. If a patient loses more than 10% of their muscle mass, the dose is reduced or the medication is stopped. This approach transforms GLP-1 from a quick fix into a monitored therapeutic tool, preserving long-term metabolic health and functionality.

Stacy cites Bill Campbell's research: sedentary women with normal weight obesity were split into two groups; the control maintained ~0.5g protein per pound of body weight, while the experimental group increased to 1.0–1.1g/lb. After 12 weeks, the high-protein group had dramatically improved body composition (less fat, more lean mass) despite no exercise intervention. Stacy uses this to argue that protein is the most overlooked macronutrient in women's nutrition, as historical low-fat/high-carb messaging pushed protein aside. She notes that the RDA is a minimum to prevent deficiency, not an optimal target for active or aging women. This insight gives women a powerful, accessible lever — simply increasing high-quality protein — to combat sarcopenia and metabolic dysfunction even before adding exercise.

Stacy explains that creatine is part of the ATP-CP energy system (the first 0–20 seconds of any movement) and is used by every tissue — brain, heart, gut, muscle. The liver makes 2–3g per day, but women have less muscle mass and tend to eat less animal protein, so their stores are lower. Supplementing at 1.5–5g daily for three weeks fully saturates tissues, leading to a 'muscle boost, brain boost' and improvement in gut issues. New studies are showing two 5g doses can help with severe fatigue from sleep deprivation and as an adjunct for treatment-resistant depression. She warns against the old 20g+ loading protocols that cause bloating and water weight, especially when paired with carbs, and emphasizes that women should avoid those. This transforms creatine into a safe, affordable, multi-system support.

Stacy distinguishes between two types of jumping: ballistic/plyometric jumps that are absorbed through muscles (good for power, less for bone) and bone-density jumps that intentionally land hard to create multidirectional stress waves through the skeleton. The bones adapt to the ground reaction forces because the ground doesn't give. She recommends that women with low normal bone density (formerly called osteopenia) follow a structured program like the Osteo Gains app, which provides 10-minute, three-times-per-week sessions of proper 'hard landing' jumps. This is not about jumping high; it’s about low jumps with maximal impact. Any jumping is better than none, but targeted protocols are necessary for those at risk of osteoporosis.