Green bananas are an excellent source of fibre. Fibres play an essential role in ensuring digestive health as well as our heart health. About 100 grams of banana has 2.6 grams of fibre. Fibres add bulk to the stool, aiding bowel regularity and facilitating smooth digestion. Consuming foods rich in fibre helps maintaining blood sugar levels. Fibres also ensure low cholesterol levels, which in turn reduces risk of stroke or attack.