Bananas are a popular and delicious tropical fruit which is the favorite of millions of people. However, everyone is attracted to the nice yellow bananas, while avoiding those with black spots thinking they’re rotten. 

However, these bananas are actually the ones that are the most beneficial – besides being richer in taste and smell, studies have shown that ripe bananas with black spots contain a compound known as Tumor Necrosis Factor (TNF), which can fight cancer cells in the body.  This makes the “ugly” bananas very beneficial for our health.

According to a recent Japanese study, TNF is a powerful anti-cancer agent that can help our immune system fight the deadly disease. By consuming ripe bananas, we can prevent a host of cancer types. The study has shown that the anti-cancer effect is stronger the more mature the banana is, but the fruit must be organic and ripened naturally.

TNF appears in bananas during the process of maturation, when the levels of antioxidants rise and produce the external spots. The same process also converts the starch in the fruit to natural sugars which are easier for digestion. Consuming ripe bananas can also stimulate the white blood cells in our body, which is why experts recommend having 2-3 ripe bananas a day. As we mentioned previously, the TNF compound will reinforce the immune system and help the body fight different infections.


TNF is a protein from the cytokine group which is released by the cells of our immune system and can resolve inflammation and reverse inflammatory conditions such as rheumatoid arthritis. TNF is compared to lentinan, a chemical immunostimulant which is administered intravenously as an anti-cancer agent. TNF is just another reason not to avoid ripe bananas – just put them in the fridge to preserve their nutrients, and eat 2-3 of them a day. However, you should avoid bananas that are completely brown – they are rotten and unfit for consumption.

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