Fructose

A simple monosaccharide found naturally in fruits, honey, and root vegetables, but consumed in massive quantities in the modern diet via sucrose and high-fructose corn syrup. Unlike glucose, which can be used by almost every cell in the body for energy, fructose is metabolized almost exclusively in the liver. This unique metabolic pathway bypasses the rate-limiting steps of glycolysis, leading to rapid fat synthesis.

Excessive fructose consumption is uniquely damaging to metabolic health because it does not stimulate insulin secretion or suppress ghrelin in the same way glucose does, often leading to overconsumption. It is a primary driver of hepatic insulin resistance, visceral fat accumulation, and elevated uric acid levels, which are linked to hypertension and gout.