Depends. The higher the fat content of dairy products the less the impact on the glycemic index. If you do not have cholesterol problems, then use whole milk and stay away from the low fat dairy products.
Low Fat Ones: Yes! Dairy contains fats, proteins ; sugars. When fat is removed, the sugars are still there, thus low fat = ?ed sugar, at least by ratio compared to before fat removed/reduced. Since dm is ?sugar (too much coming in, beyond body cells ability to burn, store as glycogen or convert to fat for storage), ?ed ratios of sugar to fat intake compounds the sugar problem. Thus focus on hf/lc. Study attia lustig.