The questionable claim: “Spotted bananas contain TNF”
This is the biggest red flag.
The article states that spotted bananas contain Tumor Necrosis Factor (TNF) and that this may help fight cancer. Fact-checkers and experts have repeatedly noted that this claim is misleading. TNF is a protein produced by animals, not something that naturally appears in bananas. The original research often cited does not show that eating ripe bananas provides TNF or prevents cancer.
Glycemic index numbers
The GI values mentioned (around 42 for less-ripe bananas and 51–60 for riper bananas) are within a reasonable range often reported in nutrition discussions, but GI varies by banana variety, ripeness, serving size, and what foods are eaten alongside it. These numbers should be viewed as approximations rather than exact rules.
Bottom line
The overall message that different stages of ripeness have different nutritional characteristics is largely correct.
