Pineapple is very rich in manganese, a trace mineral important in the formation of connective tissue and bones. The University of Maryland Medical Center states that manganese also plays a role in the metabolism of fat and carbohydrates, as well as affecting calcium absorption and blood sugar regulation. In addition, manganese is vital for normal brain and nerve function, and has antioxidant properties. The World’s Healthiest Foods states that 1 cup of pineapple delivers 2.56 mg, which is 128 percent of the daily recommended value.
Pineapples are an excellent source of vitamin C, yielding 23.87 mg a cup and contributing 40 percent of the recommended daily value. The World’s Healthiest Foods notes that vitamin C is the body’s most important water-soluble antioxidant, helping to protect against damage from free radicals and thereby helping to reduce incidence of atheroclerosis and diabetic heart disease. Vitamin C may also help cut risk of colon cancer and reduce inflammation in joint diseases.