Because of this our digestive systems have to work extra hard to digest this food. This is often the reason we wake up tired the next day even after 7-8 hours sleep as our digestive systems our forced to work through the night to digest our food. This consists as much of what foods we shouldn't eat together as much as what foods to eat. For instance you shouldn't eat high protein foods like meat with heavy carbohydrate foods like potatoes, rice pasta, cereals, beans and breads at the same meal. Because starches and proteins in a concentrated form are not compatible at the same meal.
Starches have an affinity for pepsin which is needed for protein digestion.
Thus meat putrefaction takes place and the starches ferment causing a souring of the stomach and the formation of gas. Don't eat fruits with other foods, they will mix with other foods and ferment in the stomach. Don't eat vinegar. It contains acetic acid which has a deteriorating effect on the liver as does alcohol. Vinegar also interferes with the digestion of starch.