What is internal organ fat?

Internal organ fat (visceral fat) is fat that accumulates in the abdominal cavity and around, and partly within, internal organs. It normally accounts for about 10% of total body fat mass, but a large amount can accumulate even in people with normal weight. Excess internal organ fat is metabolically active and increases the risk of cardiovascular diseases, type 2 diabetes, and fatty liver, among others. The amount is reliably measured with a body composition measurement.