Alkaline food ranking: kelp, water shield, purslane, grapes, spinach, mushrooms, lettuce, citrus, persimmon, cauliflower, enoki mushroom, winter melon, cucumber, loofah, fish.

The pH value of the human body refers to the acidity and alkalinity of the blood. Under normal physiological conditions, acid-base imbalance does not easily occur in the human body, and there is no so-called "acidic constitution." The blood of healthy people is slightly alkaline at around PH7.4. If the body's acidity or alkalinity temporarily increases, the respiratory system will react within a few minutes to speed up or slow down the elimination of carbon dioxide (acidity), thereby adjusting the pH value to normal within a few minutes. The kidneys, urine excretion system and blood system also regulate the pH value through a strong balance, so no one’s blood is acidic (PH<7.0), and there is no such thing as “acidic constitution causes disease”.

Some people think that "acidic constitution" does not refer to PH<7, but refers to a physical state similar to "imbalance of yin and yang" in traditional Chinese medicine. It should be noted that this type of theory is not supported by large-scale human data, and there are no objective standards to test it.

For cancer, it is not the so-called "acidic body" that induces tumors, but the growth of tumors will cause the microenvironment around solid tumors to become acidic. Because tumor cells grow faster than normal cells, and the supply of blood vessels in tumor tissue often cannot keep up with the rapid expansion of tumor cells, the supply of oxygen and nutrients is insufficient. Therefore, tumor cells are deprived of oxygen and nutrients, and their metabolism has also changed, producing more acidic metabolites such as lactic acid, resulting in a lower pH value of the tissue fluid surrounding the tumor tissue.