Guava is low in calories and fats but carry several vital vitamins, minerals, and antioxidant polyphenolic and flavonoid compounds that play a pivotal role in the prevention of cancers, aging, infections, etc.
The fruit is a very rich source of soluble dietary fiber (5.4 g per 100 g of fruit, about 14% of DRA), which makes it a good bulk laxative. The fiber content helps protect the colon mucosa by decreasing exposure time to toxins as well as binding to cancer-causing chemicals in the colon.
Scientific studies suggest that regular consumption of fruits rich in vitamin-C helps the human body develop resistance against infectious agents and scavenge cancer causing harmful free radicals from the body. Further, it is essential for collagen synthesis within the body. Collagen is one of the chief structural protein in the human body necessary for maintaining the integrity of blood vessels, skin, organs, and bones.
The fruit is a very good source of Vitamin-A, and flavonoids like beta-carotene, lycopene, lutein and cryptoxanthin. The compounds are known to have antioxidant properties and therefore essential for optimum health. Further, is also critical to maintaining healthy mucosa and skin. Consumption of natural fruits rich in carotene is known to protect from lung and oral cavity cancers.
100 g of pink guava fruit provides 5204 µg of lycopene, nearly twice the amount than in tomatoes. (100 g tomato contains 2573 µg of lycopene). Studies suggest that lycopene in pink guavas prevents skin damage from UV rays and offer protection from prostate cancer.
Guava-fruit is an excellent source of antioxidant vitamin-C. 100 g fresh fruit provides 228 mg of this vitamin, more than three times the required DRI (daily-recommended intake). Flesh just underneath its thick outer rind composes exceptionally higher levels of vitamin-C than its inner creamy pulp.
Fresh fruit is a very rich source of potassium. It contains more potassium than other fruits like banana weight per weight. Potassium is an important component of cell and body fluids that helps controlling heart rate and blood pressure.
Further, the fruit is also a moderate source of B-complex vitamins such as pantothenic acid, niacin, vitamin-B6 (pyridoxine), vitamin E and K, as well as minerals like magnesium, copper, and manganese. The human body uses manganese as a co-factor for the antioxidant enzyme, superoxide dismutase. Copper required for the production of red blood cells.