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Suspect acidity if you:* take excessive strenuous exercise, which causes lactic acid to accumulate in the blood* are diabetic, which tends to cause acidosis through loss of potassium, sodium and ketones in the urine* suffer from chronic diarrhoea, which can cause acidosis* have kidney problems, which can also cause acidosis (Kidney Int Suppl, 1999; 73: S85-8)* follow the ketogenic diet, which works for epileptics, but has a deliberately acidifying effect * are even mildly lactose-intolerant, as dairy products can cause lactic acidosis (Rose BD, Post TW