Because of their impressive potassium content, bananas are highly recommended by doctors for patients whose potassium is low. One large banana, about 9 inches in length, packs 602 mg of potassium and only carries 140 calories. That same large banana even has 2 grams of protein and 4 grams of fiber. No wonder the banana was considered an important food to boost the health of malnourished children! Those reducing sodium in their diets can't go wrong with a banana with its mere 2 mgs of sodium. For the carbohydrate counters there are 36 grams of carbs in a large banana.

Vitamins and minerals are abundant in the banana, offering 123 I.U. of vitamin A for the large size. A full range of B vitamins are present with .07 mg of Thiamine, .15 mg of Riboflavin, .82 mg Niacin, .88 mg vitamin B6, and 29 mcg of Folic Acid. There are even 13.8 mg of vitamin C. On the mineral scale Calcium counts in at 9.2 mg, Magnesium 44.1 mg, with trace amounts of iron and zinc.

Putting all of the nutritional figures together clearly shows the banana is among the healthiest of fruits. The plantain, when cooked, rates slightly higher on the nutritional scale in vitamins and minerals but similar to the banana in protein and fiber content.