Every 25-year-old trainer will tell you “just eat less and move more.” As a nutritionist with 20+ years of clinical experience, I can tell you that advice is destroying women’s metabolisms after 40. Here’s what I see constantly in my practice: women fasting too long, eating one meal a day, going ultra-low carb and GAINING weight. Then they eat MORE and the scale finally moves. Sounds backwards? It’s not. It’s science. When you chronically undereat, your body triggers a stress response. Research shows fasting and severe caloric restriction significantly elevate cortisol levels, activating the HPA axis, your body’s alarm system (Tomiyama et al., Psychosomatic Medicine, 2010). High cortisol = belly fat storage. Your body thinks it’s in survival mode. It gets worse. Severe caloric restriction for too long reduces your active thyroid hormone (T3), while increasing reverse T3 — an inactive form that blocks your metabolism. Your leptin drops, your ghrelin surges, and your body fights y...