There are two types of protein found in dairy products: casein and whey protein.
Cheese is made mostly of casein, where most of the liquid whey found in milk has been filtered or strained out.
Casein’s slow digestion rate may put strain on the digestive system.

Foods to avoid

Butter
Milk
Cream
Yogurt
Sour Cream
Cheese
White or Milk Chocolate
Ice Cream
Creamed Soups and Vegetables
Soup Bases
Puddings
Whey
Custard