Fried food tends to overwhelm the stomach, resulting in acid reflux and heartburn. Rothenberg says that fried foods sit in your stomach similarly to processed foods. It takes the body much longer to digest fried foods due to their high fat content, making them foods that cause belly fat.
Milk and high-lactose dairy foods
A key component to keeping your tummy happy is the avoidance of FODMAPs, or rapidly fermentable carbohydrates that can aggravate your gut. Some people aren’t sensitive to any FODMAPs, some experience symptoms after eating only certain ones, and other people develop gradually worsening effects with each exposure. Lactose, found in all animal milks, is the best-known FODMAP. Lactose is broken down in the small intestine by an enzyme called lactase. Our bodies produce less lactase as we get older (since its main purpose is to help babies digest breast milk), which means dairy foods that contain lactose can torment our tummies over time even if they didn’t before.
Found in: Milk, regular (non-Greek) yogurt, soft cheeses, dairy-based desserts.
Excess fructose (in apples, honey, asparagus)
Foods with a lot of fructose (another FODMAP) compared with glucose can contribute to gas, bloating, and diarrhea. A 2008 study in the Journal of Clinical Gastroenterology found that patients with IBS who followed a non-fructose diet had fewer symptoms.
Found in: Certain fruits (apples, mangoes, watermelons); certain vegetables (asparagus, sugar snap peas); sweeteners (high-fructose corn syrup, agave nectar, honey).