Generally speaking, most vegetables and fruits have an alkaline-forming effect on your body fluids.
Most grains, animal foods, and highly processed foods have an acid-forming effect on your body fluids.
Your health is best served by a good mix of nutrient-dense, alkaline and acid-forming foods; ideally, you want to eat more alkaline-forming foods than acid-forming foods to have the net acid and alkaline-forming effects of your diet match the slightly alkaline pH of your blood.
The following lists indicate which common foods have an alkaline-forming effect on your body fluids, and which ones result in acid ash formation when they are digested and assimilated into your system.