Animal foods, which are concentrated sources of protein, are highly acid-forming foods. Eating large quantities of meat, fish, poultry, eggs and cheese might result in a surplus of amino acids, as well as the mineral sulfur, that form acidic compounds during normal metabolism. Refined carbohydrate foods such as pasta, packaged cereals and sugars are also highly acid-forming. Other acid-forming foods are: most legumes such as beans, lentils and peanuts; most grains such as wheat, rye, rice, oats and corn; some nuts such as cashews; alcohol; coffee; and tea.
Most fruits and just about all vegetables are alkaline-forming. A few exceptions are cranberries and blueberries, which are somewhat acid-forming. Ironically, acidic fruits such as lemons and limes are actually alkaline-forming once metabolized. Fruits and vegetables are good sources of minerals such as potassium, magnesium and calcium that participate in regulating the pH of body fluids and correct excess acidity. “Nutrition Journal” published a study in 2009 in which subjects increased the pH of their blood and urine by taking supplements containing these minerals. Food is preferable, however.