You could be working out consistently, eating clean, and still wonder why your stomach feels bloated. Well, certain foods mess with digestion in sneaky ways, leaving you looking fuller than you really are. Here are 9 foods that could be sabotaging your flat-stomach goals.
9. Beans and Lentils

Beans and lentils are packed with protein and fiber, but they come with a catch: they’re loaded with complex sugars your gut can’t break down easily. As these sugars ferment, they create gas, leaving you bloated. That’s why a hearty bowl of chili can sometimes feel like a balloon expanding in your belly.
8. Cruciferous Vegetables (Broccoli, Cauliflower)

Broccoli, cauliflower, and cabbage are great options when it comes to vitamins and fiber, but they’re also infamous for making your stomach swell. That’s because they contain raffinose, a natural sugar humans can’t digest. Instead, it ferments in your gut, creating gas bubbles that leave you feeling gassy. Steaming or roasting these veggies can break down some of the tough fibers, though.
7. Dairy Products

Cheese and ice cream may taste divine, but they can wreak havoc on digestion. Around 75% of the global population struggles to properly digest lactose, the natural sugar in dairy. For some, this means a puffy belly after pizza; for others, it’s intense cramping and bloating. Switching to lactose-free or plant-based alternatives can keep your stomach flatter without giving up creamy indulgences.
6. Wheat, Barley, and Rye

Breads, pastas, and cereals made from wheat, barley, and rye are often a hidden cause of bloating. These foods contain gluten, which many people struggle to digest. Additionally, they’re rich in FODMAPs, which are fermentable carbs that quickly turn into gas in the gut.
5. Onions and Garlic

Onions and garlic are kitchen staples that contain fructans, a tricky type of carbohydrate. While delicious, fructans tend to ferment in your gut, producing gas that causes uncomfortable swelling. Even small amounts can trigger bloating for sensitive people. Thankfully, there are garlic-infused oils and onion powders that deliver the savory taste without as much of the stomach-upsetting effect.
4. Apples and Pears

Apples and pears are high in fructose and sorbitol, two natural sugars that many people struggle to absorb. Add in the fiber-rich skin, and you’ve got a recipe for fermentation and gas. The result? A snack that can leave you feeling uncomfortably full and round. To avoid the bloat, try swapping in lower-fructose options like berries or citrus.
3. Fatty and Fried Foods

Greasy burgers, fried chicken, and loaded fries can sit in your stomach longer. High-fat foods take much more time to digest, which means they linger, ferment, and trap gas in your gut. The result is that sluggish, heavy feeling you get after eating. While occasional indulgence is fine, too much deep-fried or fatty fare can undo your flat-stomach progress.
2. Artificial Sweeteners

That “sugar-free” gum or protein bar can be a sneaky belly bloater. Sugar alcohols like sorbitol and xylitol aren’t fully digested by your body. Instead, they ferment in your gut, producing gas, and sometimes even triggering a laxative effect. If you want something sweet, natural alternatives like honey or fruit may be gentler on your stomach.
1. Processed Foods with Inulin

Yogurts, granola bars, and even some “healthy” shakes are often fortified with inulin. This is a chicory-root fiber marketed as good for digestion. The problem? Inulin ferments very quickly once it hits your gut, leading to large amounts of gas in a short period of time. Always check labels if your stomach feels off after eating processed health foods.