Here are five good reasons it just might be lentils. 1) Lentils, a fine source of plant protein, don’t take hours to cook, unlike other dried beans. 2) Lentils are rich in soluble fiber, which helps control blood cholesterol. 3) Lentils provide some calcium, iron and other trace minerals. 4) Lentils are one of the best sources for folic acid, a B vitamin critical for preventing neural tube defects. 5) Lentils may protect against some types of cancers and lower heart disease risk.