Nutrition Myths
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Acid ash hypothesis

The ash-diet hypothesis says that some foods containing acid-forming substances (such as animal protein from milk or meat and some plant foods) cause the blood pH to drop or become less alkaline. This effect is then buffered by minerals released from bones. That loss of minerals from the bones is supposedly responsible for mineral bone loss and the resulting osteoporosis.

Supporters of this hypothesis believe that a typical Western diet predominantly consists of these acid-forming foods and that following this diet puts us in a permanent state of mild acidosis which in the long term leads to gradual mineral bone loss. (1, 2)

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Do acid-forming foods cause osteoporosis? Acid-forming diets can cause osteoporosis if combined with a calcium intake consistently below the recommended daily value. Increasing the calcium intake may improve the bone health.
Does a diet high in acidic foods make the urine acidic? Acidic foods (foods with low pH) don't necessarily influence the acid-base balance of the urine. Urine's pH depends rather if the they are acid-forming or base-forming foods.
Do acid-forming foods make urine more acidic? Acid-ash foods contain minerals which lower the fluids' pH. To maintain the blood at its optimum acid-base level the body removes the acidic substances trough urine, making it more acidic.
Difference between acidic food and acid-forming food Acid-forming foods and acidic foods are unrelated and produce different effects on the body. Acid-forming foods may reduce the urine pH level, with no impacts on health. Acidic foods don't have an impact on the body's pH...
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