Beware "white tuna" -- it's often not a member of the tuna family at all. Escolar is commonly marketed as white tuna, super white tuna, butterfish and walu. Escolar is edible -- and legal -- but the Food and Drug Administration does not encourage its consumption. It includes a waxy substance, called gempylotoxin, that humans can't digest and can cause purgative effects.

Educate yourself and train your palate. Does it taste, smell and look right? If you're wary, search online to see if that particular brand has been reported as fraudulent before.

Petition the FDA to set standards for the most commonly fraudulent products, like honey and olive oil.