Why are additional fat-soluble vitamins often added to some low-fat and low-calorie products?

A: Fat-soluble vitamins can dissolve while the product is on the grocery shelf
B: some fat-soluble vitamins are hard to measure in small amounts
C: some fat substitutes can prevent absorption of fat-soluble vitamins
D: fat-soluble vitamins are absorbed in the body very slowly

C: some fat substitutes can prevent absorption of fat-soluble vitamins

Low-fat and low-calorie products often contain fat substitutes in place of natural fats. Some fat substitutes may interfere with the absorption of fat-soluble vitamins, so additional fat-soluble vitamins are added to ensure that consumers still receive adequate amounts of these essential nutrients.