Meat is animal flesh, though fish is conventionally excluded from the definition. Meat is mostly water and protein, along with fat amid muscle. Up to 77% of the calories in red meat come from its fat, most of it saturated.
The nutritional value of different meats varies widely. As meat is muscle, its protein is nutritionally balanced, and it contains vitamins and minerals that muscle tissue needs, notably vitamin B, iron, phosphorous, and zinc.