Body pH can be an important indicator of health. Normal blood pH is a slightly alkaline 7.4. Doctors and naturopaths have promoted an alkalizing diet in order to raise the pH of urine and saliva, which fluctuate more than blood pH, for optimum health. The pH of the body can be affected by the foods you eat. Alkalizing foods, such as green vegetables and legumes, will raise the body's pH, while acid-producing foods will lower the body's pH. Alkaline and acid don't describe the food itself but rather its effect on your body upon being metabolized.