What it is: 

An eating style which does not include gluten, a protein found in some grains (wheat, barley, rye.)

Why you'd want to eat this way: 

You have celiac disease

You are or suspect you have a gluten intolerance or sensitivity

You are allergic to wheat

What's allowed: 

Meats (red, white, poultry, fish, seafood)

Vegetables

Fruits

Fats (oils and butter)

Grains that do not contain gluten (rice, spelt, oats, buckwheat, amaranth, corn, teff, quinoa, sorghum)

What's NOT allowed: 

Grains with gluten:

wheat, rye, barley, couscous:

(This includes all breads, pastas, pastries, muffins, cakes, etc commercially made unless otherwise specified)

Any processed foods that contain gluten (package will sometimes say--or will specify if 'gluten-free')