Since the advent of controversial diets such as Atkins, various diets that stress the eating habits of "natural humans" have been developed. The Paleolithic Diet imitates the way people ate during the Stone Ages. These eating plans include basically natural foods (those not processed by humans). Whereas the Paleolithic Diet excludes milk and grain-foods, The Evolution Diet excludes human-made ingredients such as partially hydrogenated oils but allows some processed foods such as whole-grain crackers and dairy products. Anthropologists who focus their research on human evolution, however, are quick to point out that the diet of Paleolithic peoples was most likely opportunistic. That is, these early humans would most likely eat whatever edible foods were available at any given moment (e.g. vegetables, termites, meat) and not restrict their intake of any food. Until recent human history, starvation has been a far greater threat than over-consumption.