Quote[/b] (micmic @ Nov. 02 2003,5:13)]To test whether you are intolerant, drink in one sitting 1lt of skim milk and then you'll know. There are various degrees of intolerance and various symptoms (gas, bloating, upset, diarrhea etc.). I didn't know I'm intolerant until I started drinking lots of skim milk (that is, until I was around 28). Now I only drink very little and there are no symptoms. Cheese and yogurt have miniscule quantities of lactose but if you overdo it they too can cause problems.