Basic Concepts of Acidic Foods and Alkaline Foods Acidic foods and alkaline foods are defined based on their effects on the body\’s acid-base balance. In the human body, the balance of acidic and alkaline substances is very important. If the body\’s acidity is too high or too low, it can affect the body\’s normal functions. Therefore, it is very important to understand the acid-base properties of food to maintain good health. The Difference Between Acidic Foods and Alkaline Foods Acidic Foods