Lactose intolerance
First fact
As you eat ice-cream when you are young you could get lactose intolerance as you grow up. Once you hit your 20's you may or may not get lactose
Second fact
Not everyone has the same side effects. Some will only have abdominal pain and diarrhea, other people will only get gas and mild reaction.
Third Fact
bloating, gas cramping or diarrhea can often last 30 minutes or two hours after consuming dairy in people that are lactose intolerance's. The more you eat milk products, the worse you will feel.