Why the dietary change works for her and not for you

You might be eating enough and still starving your body Most fitness enthusiasts focus on calories in vs. calories out. But a growing body of research shows that the real question is different: how much energy is actually left for your body's vital functions after exercise? The answer can be dangerously low, even when your calorie balance looks perfectly fine on paper. This article explains the concept of energy availability, how to calculate it, and why falling below a critical threshold (even briefly) can cause irreversible damage to your bones, hormones, and performance.