Alkaline foods are those whose inorganic salts are alkaline. Most people have a vague understanding of the acidity and alkalinity of food, believing that something sour like a lemon is acidic. In fact, the acidity or alkalinity of food is not determined by its simple taste. The so-called acidity or alkalinity of food is determined by its final metabolic products in the human body. If the metabolic products contain cations such as calcium, magnesium, potassium, and sodium, it is an alkaline food; conversely, if it contains more sulfur and phosphorus, it is an acidic food.
After entering the body, alkaline foods are neutralized by pancreatic juice, bile, intestinal fluid, and carbonic acid, then absorbed by the liver and quickly burned into carbon dioxide, placing no burden on the body. Therefore, people with poor digestive function should try to avoid excessive intake of acidic foods, especially reducing the intake of protein, fat, and starch-based foods, and increasing the proportion of alkaline foods.