Is Dairy Good <br />or Bad for You? Once thought to be essential to our diet, a glass of milk today is often met with fear of indigestion or even disease. Lactose intolerance affects around 65% of the population. Dairy is the leading source of saturated fat in the U.S. diet and contains cholesterol <br />and sodium. It's generally best to limit dairy intake, 1. Pay attention to dairy add-ons 2. Make a diet switch 3. Get outside and exercise