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Mitochondrion connected by flowing lines to an illustrated muscle and molecular symbol.

How Your Body Produces Energy during Exercise?

ATP regeneration draws on overlapping energy pathways whose contributions shift with exercise demands, keeping muscle work supplied with usable energy.

Molecular structure connected to illustrations of a flame, liver, and colored components.

Carbohydrates Aren’t Just Fuel

Carbohydrate metabolism supplies more than immediate energy, providing glucose-derived material that cells can store or use to build molecules.

Bowls of sugars, corn, and fruit beneath an illustrated liver.

Which Is Worse: High-Fructose Corn Syrup or Other Sugars?

High-fructose corn syrup has not consistently caused greater weight gain than sucrose when calorie intake is comparable in controlled studies.

Food entering an illustrated stomach and small intestine, with nutrient particles alongside.

What Happens to Food after It Leaves Your Stomach?

The small intestine mixes and moves chyme as enzymes break down food, bringing nutrients close to the surface where absorption occurs.

Liver and kidney connected by a molecular structure and flowing lines.

How Your Body Makes Glucose When Blood Sugar Falls

Gluconeogenesis makes glucose from noncarbohydrate materials, helping the liver and kidneys maintain blood glucose when dietary fuel is unavailable.

Food connected to fat cells, a flame symbol, and a mitochondrion.

Why Fat Burning Is Not the Same as Fat Loss

Low-carbohydrate diets can increase fat burning, but losing stored body fat still requires an energy deficit sustained over time.

Intestinal illustration with clusters of microbes and particles flowing below.

What Happens to Fiber Your Small Intestine Can’t Digest?

Colon microbes ferment some dietary fiber into short-chain fatty acids that the body can absorb, recovering energy human enzymes cannot release.