The Power of Eating Banana Bananas are powerful superfoods needed in our diet. What are the dark spots found in Bananas. The answer to this question may surprise you. Actually throwing out the Bananas at this point may be a mistake. It is found that the darker the Banana or black spots on the skin, it will contain TNF. TNF stands for Tumor necrosis factor alpha  described in Wikipidea as: (TNF, tumor necrosis factor alpha , TNFα, cachexin, or cachectin) is a cell signaling protein (cytokine) involved in systemic inflammation and is one of the cytokines that make up the acute phase reaction. It is produced chiefly by activated macrophages, although it can be produced by many other cell types such as CD4+ lymphocytes, NK cells, neutrophils, mast cells, eosinophils, and neurons.[3] TNF helps fight cancer and inflammation and interferes with Tumor growth. Also Ripe bananas are found to contain serotonin, dopamine and norepinephrine. High levels of Antioxidants means: