Normally we'd be all about munching down on cruciferous vegetables like cauliflower, cabbage, brussels sprouts, and broccoli, but not if you are aiming for a flat belly. Like beans, these veggies contain a sugar that is broken down in the body by methane-producing bacteria. The result? A bloated belly and a not-so-sweet effect that will have guests remembering you for the wrong reason as you march down the aisle.
While we're never ones to suggest cutting down on nutritionally-dense veggies, keep these to a minimum, and eat them cooked rather than raw; this will help to break down the gas-producing sugar.