How Can You Tell Whether Weight Loss After 50 Is Coming From Fat or Muscle?

By How Things Work 001

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You step on the bathroom scale and the number goes down. It feels like a victory—but is your body actually burning stored belly fat, or is it quietly dismantling your own muscle tissue? As we cross into our 40s, 50s, and beyond, the rules of human physiology change. A biological phenomenon called "anabolic resistance" makes it much easier for the body to burn precious muscle instead of fat when you cut calories. In this episode of Inside the Body, we go beneath the skin to watch the exact biological sequence that unfolds when a calorie deficit begins. We will explore: • Why the first 5 pounds you lose are almost never fat. • How your liver, fat cells, and skeletal muscles compete for energy. • The hidden danger of losing weight without protecting your muscle mass. • Physical signs that prove you are losing fat instead of muscle (without needing an expensive body scan). • The exact habits—like protein timing and mechanical tension—that force your body to burn visceral fat. If y

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