Energy debt, not a calorie problem
Chris argues that cravings and low energy often trace back to how well cells convert fuel into energy, not how much fuel is available. When fructose metabolism runs through the enzyme fructokinase, it consumes ATP on its way to producing uric acid, which research associates with cellular stress and a slowdown in mitochondrial output. The result is a cell that signals hunger even when the body already has plenty of fuel on board.

