Plantains relatively are rich in calories. 100 grams of plantain holds about 122 calories. They are very reliable sources of starch and energy.

It contains 2.3 g of dietary fiber per 100 g (6% of DRA per 100 g). The adequate amount of dietary fiber in the food helps regular bowel movements, thereby reducing constipation problems.

Fresh plantains also contain vitamin-C 100 grams provide 18.4 mg or 31% of daily required levels of this vitamin. 

Consumption of foods rich in vitamin-C helps the body develop resistance against infectious agents and scavenge harmful oxygen-free radicals.

However, boiling and cooking destroys much of this vitamin in plantains.
Plantains are rich in vitamin A . 100 grams fresh ripe plantains contain 1127 IU or 37.5% of daily required levels of this vitamin.

Besides being a powerful antioxidant, vitamin-A plays a vital role in the visual cycle, maintaining healthy mucosa, and enhancing skin complexion.

Plantains are rich in B-complex vitamins, particularly high in vitamin-B6 (pyridoxine). Pyridoxine is an important B-complex vitamin that has a beneficial role in the treatment of neuritis, anemia, and to decrease homocysteine (one of the causative factors for coronary artery disease (CHD) and stroke episodes) levels in the body. Also, the fruit contains moderate levels of folates, niacin, riboflavin, and thiamin.

They also provide adequate levels of minerals such as iron, magnesium, and phosphorous. Magnesium is essential for bone strengthening and has a cardiac-protective role as well.

Fresh plantains are rich in potassium. Potassium is an important component of cell and body fluids that helps control heart rate and blood pressure, countering the adverse effects of sodium.