Lobsters

More than one-third of restaurants, including Red Lobster, swap out lobster for more inexpensive substitutes in their dishes, reports Inside Edition. In February, the news organization ran DNA tests on lobster dishes from 28 restaurants across the country. Thirty-five percent of the samples contained cheaper seafood, such as whiting and langostino.

While langostino means "little lobster" in Spanish, the crustacean is more similar to a hermit crab — and less expensive than American lobsters.