If you have digestive problems, green bananas can leave you feeling gassy or bloated.ĭr Schenker suggests the health benefits of yellow bananas trump those of green ones. The lower quantities of resistant starch also means yellow bananas are easier to digest. ‘This is what makes them a good source of quick release energy for athletes,’ says dietitian Dr Sarah Schenker. Yellowĭuring ripening, the starch in a banana is converted into sugar - from 3.2g/100g in an unripe banana to 12g/100g in a ripe one. The cooling process causes the starches to form a new structure which is even more resistant to digestion (called ‘starch retrogradation’). Other research has shown that chilling cooked green bananas in the fridge increases resistant starch by a further 50 per cent. In fact, one study published in the Malaysian Journal of Nutrition in 2018 found boiling green bananas increased their resistant starch content. Unlike other foods, bananas contain a form of resistant starch that is increased, rather than degraded, by heating.
They may also assist in preventing or treating type 2 diabetes. A green banana typically has a glycaemic index (GI) of 30, compared to 58 for a ripe banana
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