Benji Xavier, a content creator from New Jersey, lost 100 pounds by making healthier versions of his favorite meals. Xavier used to eat a lot of fast food because it was convenient.

If a 105-pound burger seems too daunting, the diner also offers the 50-pound Mt. Olympus, which challenges four customers to finish in one hour for a prize of $1,000; the 15-pound Zeus, which must ...