Banana is one of the best fruits available and it is packed in a natural container. It is a fast fruit and free from local contamination. It is available in different varieties in the tropical area of this world.
The nutrients in 100 g edible banana include:

• Water – 73.9 g
• Protein – 1.2 g
• Fat – 0.2 g
• Carbohydrates – 20.0 g
• Organic acids 0.6 g – Malic acid 360 mg, Citric acid 200 mg
• Fibre – 1.8 g
• Minerals - 0.8 g – sodium 1 mg, potassium 370 mg, magnesium 30 mg, calcium 7 mg, iron 350 micro g, copper 110 micro g, zinc 195 micro g, selenium 1 micro g, iodide 2 micro g.
• Vitamins - vitamins A, B1, B6, nicotine amide, pantothenic acid, Biotin, folic acid, vitamin C – 12 mg, vitamins E, and K

Banana contains glucose, fructose and sucrose which contain 50% glucose and 50% fructose. Commonly we say fructose as fruit sugar. Excess sugar is converted in the liver as triglycerides, the blood fat. Fructose is metabolized in the liver and the excess is also converted into triglycerides.

If you have diabetes you can eat a small banana, but the amount of carbohydrates must be reduced from the other meals. It is advisable not to eat very ripe banana.

Minerals, particularly selenium varies with their concentration in the soil.