According to a latest Research by Japanese Scientist, a full ripe banana with dark patches on the yellow skin turn out to produce a substance called TNF (Tumor Necrosis Factor) more effectively, which has the capability to combat abnormal cells. The darker patches it has, the higher its immunity enhancement quality. Hence, riper banana better the anti-cancer quality.
A yellow skin banana with dark spots on it is 8 times more effective in enhancing the property of white blood cells than a green skin version. So, by eating just 1 or two banana a day can increase immunity in our body.