Reading about acidity I found this

"FOODS TO AVOID Very few of us know that pleomorphic bacteria, yeast and fungus and their toxins are characteristically present in stored and fermented food. The following list of foods are high in pleomorphic bacteria, yeast, fungus and mould, and produce mycotoxins which cause specific diseases and should never be eaten. The problem is excess sugar. Grape juice and grapefruit juice are a little different. ... Apples, oranges, pears and bananas are more likely to be fermented. The banana get liver spots the same way you get liver spots, through excess fermentation and rotting. If you have spots on your hands, face or arms, if you have moles, these are toxins coming to the surface of the skin. These are acids. This is a manifestation of the one sickness. You have to change the inner terrain, and if you do, these spots will either disappear or change in colour.

FOOD YOU SHOULD EAT: ALKALINIZING FOODS We need to eat foods which will actually heal the body. We need to go back to the garden and eat live foods like leafy greens, foods which are high in chlorophyll. For breakfast I eat salad, for lunch I eat salad, and for dinner I have salad. What is good for dinner is also good for lunch, and what is good for lunch is good for breakfast. You have to overalkalize the blood and tissues. You can freely eat dark green and yellow vegetables, root vegetables, freshly juiced vegetable juices, foods with high contents of chlorophyll, nuts like almonds or hazelnuts which are more alkaline. Almonds are high in oxygen especially after they have been soaked for 12 hours. Sprouted grains and beans like alfalfa, mung beans, clover and radish, seeds, essential fatty acids from flax oil, borage oil, and virgin olive oil, soy products like tofu, grains from spelt, millet and buckwheat, herbs, spices, seaweed, lots of onions and garlic and distilled water. Fruits like avocados, lemons, limes and grapefruits are low sugar, therefore less likely to be fermented."

What do you think as to its validity?

Bananas have been one of my main foods.