Female-Specific Exercise & Nutrition for Health, Performance & Longevity | Dr. Stacy Sims

Andrew Huberman interviews Dr. Stacy Sims on how female physiology changes nutrition and training needs across the lifespan. They cover why fasted training and intermittent fasting tend to harm active women, how to fuel before and after workouts, and how the menstrual cycle, perimenopause, and menopause reshape what training works. Sims makes the case for polarized training—heavy resistance work plus true high-intensity intervals, with easy walking for recovery—over the moderate-intensity cardio most women default to. They also dig into birth control, iron, caffeine, cold and heat exposure, a sauna protocol that boosts blood volume, supplements like creatine and adaptogens, and training during pregnancy.

• Sims says intermittent fasting is very detrimental for active women unless they have PCOS or another subclinical issue, because women are already metabolically more flexible than men.
  00:08:20
• Women have two areas of kisspeptin neurons versus one in men, so going unfueled disregulates thyroid and luteinizing hormone within about four days.
  00:10:55
• She calls out Orange Theory, F45, and Soul Cycle as inappropriate for the women they market to—moderate intensity that drives cortisol without triggering the beneficial hormone response.
  00:48:43
• The belief that high-intensity training disrupts the menstrual cycle is a myth—it is underfueling, not the training, that causes problems.
  01:06:31
• A 2024 study found oral contraceptives change the amygdala and increase fear; reversible in adults but unknown for developing young girls.
  01:17:02
• Huberman warns half a piece of nicotine gum is dangerously pleasant and habit-forming, and a dermatologist told him it is terrible for skin.
  01:32:37
• Sims shares a post-training sauna protocol (up to 30 min, slight dehydration) that expands blood volume like altitude training—for both men and women.
  01:43:38
• Jump training three times a week for 10 minutes has moved women from osteopenia to normal bone density over four months.
  02:07:34

• Endocrine dysfunction tipping point is ~15 calories per kg of fat-free mass for men but ~30 for women—women need far more fuel.
  00:32:35
• Reproductive-age women need ~35g of leucine-rich protein within 45 min post-workout; perimenopausal women need 40-60g due to anabolic resistance.
  00:27:22
• Women's metabolism returns to baseline within ~60 minutes after training, versus up to 3 hours for men, giving women a tighter recovery window.
  00:27:53
• Only about 15g of protein is needed before strength training; add 30g of carbohydrate for cardio up to an hour.
  00:23:17
• Ice baths are too cold for women; ~16°C (55-56°F) gives the dopamine response without severe vasoconstriction.
  01:36:44
• Sims prefers true Finnish sauna over infrared, which warms the skin but not the core, and notes sauna heat can shut down hot flashes.
  01:35:41
• Recommended creatine dose is 3-5g monohydrate daily; she favors CreaPure because its water-based wash causes fewer GI side effects than acid-washed versions.
  01:53:30
• Women lose about one-third of their bone mass at the onset of menopause without intervention.
  02:07:02
• A pilot study found deliberate cold exposure around ovulation for 10 days over three cycles attenuated endometriosis.
  01:40:29
• Sims recommends women target roughly 1 to 1.2g of protein per pound of body weight (about 2-2.3g/kg) per day.
  02:08:37

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