All grains contain starch. The majority of grain-based foods in your diet should come from whole grains, however. Aside from starch, these foods are full of other nutrients like B vitamins, iron, magnesium and fiber.ifferent Kinds of Vegetables. All veggies contain a little starch, but some are classified as nonstarchy. These vegetables, including lettuce, peppers, asparagus, onions, eggplant and artichokes, are very low in starch.
The natural diet of the horse is grass. Grass contains most of the nutrition a horse requires to be healthy. It also contains silica, which is important for dental health. Primitive horses can live on sparse rations and often have to make do with less than ideal pasture and living conditions.
However, horses may also be fed small amounts of other grains like corn. Some grains like wheat, aren't good for horses. The seed head of grasses would be the closest thing a wild horse would come to eating grains in their natural environment. Grains that are grown, harvested and processed as we do now, are not natural foods for horses. It is easy to feed too much grain to horses.