The Paleolithic diet, which began debuting as early as the 1960s, encourages mimicking the diet of the Pleistocene epoch. This “caveman diet” eliminates processed foods that were not available to the ancestors of modern day humans, including nutrient deficient white bread, sugary cereals, all artificial flavors and alcohol. But it also eliminates dairy, grains and legumes. Intermittent fasting, while simultaneously exercising, to mimic the hunter-gatherer lifestyle is also practiced in the paloe diet. The diet has garnered criticism from some nutritionists and historians.