The last thing you want when you're hitting the pool, heading to the beach or relaxing really hard in a resort lounge chair is to feel like you're carrying around a balloon in your abdomen. But sometimes that's exactly what happens, despite loyally devoting yourself to abtastic workouts. What gives?

"Narrowing in on the exact reason for your bloat can be tricky, whether it's dehydration or your menstruation cycle," says dietitian Stephanie Middleberg. But often what you're eating is the culprit. The upshot: By nixing certain foods in favour of others, you can easily deflate your midsection and feel slimmer by tomorrow. Here are the foods you should toss out — and belly-friendly alternatives to invite into your diet.