These glands are:

* Salivary glands: Produce saliva, which contains amylase that breaks down starches.

* Pancreas: Produces pancreatic juice, which contains enzymes like lipase (breaks down fats), protease (breaks down proteins), and amylase.

* Liver: Produces bile, which isn't an enzyme itself but aids in the digestion of fats.

These glands are essential for the breakdown of food into smaller molecules that can be absorbed by the body.