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Different parts of our body have different pH values because different parts of our bodies serve different purposes. For example, the pH value of human saliva is 6.5-7.4 and the pH value of human blood is 7.3-7.4. The pH value of human skin is 5.5 and the skin needs to be slightly acidic in order to cope with environmental factors like bacteria and other toxins. The stomach and other parts of the digestive system need to be highly acidic due to biological necessity. Hence the pH value of digestive acids is highly acidic.
pH balance is an important component of good health. When the pH level of your body becomes more acidic, the body uses its built-in buffering systems to neutralize them. Even small changes in blood pH can be extremely harmful.