Exercise & Nutrition Scientist: The Truth About Exercise On Your Period! Take These 4 Supplements!

Dr. Stacy Sims challenges the assumption that exercise and nutrition science applies equally to men and women. Throughout this conversation with Steven Bartlett, she reveals how decades of male-focused research have left women operating without proper guidance for their unique physiological needs. The fundamental issue is that women are not simply smaller men. They have different hormonal systems, body compositions, cardiovascular capacities, and metabolic responses to exercise and nutrition. Sims highlights several key physiological differences. Women have wider Q-angles in their hips, leading to increased ACL injury risk. They have different fat distribution patterns, with women naturally carrying more essential fat for reproductive health. Their hearts and lungs function differently in response to training. Crucially, women have lower baseline testosterone and different estrogen fluctuations throughout their menstrual cycle, which dramatically impacts performance, recovery, and nutritional needs. The conversation shifts to how these differences require fundamentally different approaches to training and nutrition. Women should not follow the same intermittent fasting protocols as men, as their hypothalamus responds differently to extended fasting periods. Their approach to weight loss, supplementation, and recovery must account for their menstrual cycle. Sims explains that women are strongest during their follicular phase when estrogen is rising, making it the ideal time for heavy strength training and high-intensity work. During the luteal phase, women require more calories and different macronutrient ratios to support their elevated metabolic needs. The episode covers specific recommendations around supplements, including creatine for muscle building and performance, which is safe and effective for women despite myths suggesting otherwise. Sims discusses the importance of bone health, particularly as women approach menopause when estrogen decline accelerates bone loss. She addresses misconceptions around ketogenic diets, explaining how they can negatively impact the female microbiome and hormonal balance. The conversation includes nuanced perspectives on biohacking trends like saunas and cold plunges, which have different effects on men and women based on their hormonal profiles. Finally, Sims addresses menopause and perimenopause, explaining that these life stages require strategic adjustments to nutrition and exercise rather than accepting decline. She emphasizes that understanding and working with female physiology rather than against it is the path to sustainable health, performance, and longevity for women across all life stages.