Whether or if your ancestors relied mostly on meat, grains, or both for their nutrition determines which of the three metabolic categories you belong to. People who depart from the healthy eating practises of their ancestors endure a weakening of their bodies' innate resistance to disease. Because of this, a person whose metabolism is dependent on the intake of grains is at risk of developing digestive issues if they make a dietary change that results in a larger consumption of meat or if they go from being a meat eater to being a vegetarian or vegan. This leads to more serious health problems, such as coronary heart disease, diabetes, problems with inflammation, autoimmune diseases, respiratory disorders, cancer, and obesity. It also increases the risk of developing these conditions.