Nutrition Myths

Acid ash

Acid-ash in food is a residue of the inorganic minerals which form acids in the body. These particles have the capacity of adding hydrogen ions to a liquid solution. An excess of hydrogen ions in a solution makes the solution acidic. It can be measured using urine tests – the more acidic the urine, the more acid-ash in the diet. (1, 2)

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Does the urine pH test measure the body’s alkaline balance? The blood's pH or body's alkaline balance is determined using blood samples. The urine pH test only measures the acidity of the urine.
Does milk cause osteoporosis? Milk, dairy products and milk derived supplements are good for bone health. The acid-ash hypothesis, which this myth originated, has been disproven by many studies.
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.
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.

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