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Carb-Dense Foods This may change the way you look at �good carbs� and �bad carbs� forever. Carb-dense foods can alter the balance of our gut flora, triggering inflammation. Foods are considered carb-dense if they have a high ratio of carb grams relative to their weight. A small potato, which many consider a bad carb, weighs 170 grams, but it�s mostly water; only about 23 percent of it is carbohydrate. A plain rice cake, by contrast, weighs only nine grams, but almost 80 percent of it is carbohydrate! Found in: bagels, bread (including whole-grain breads), crackers, pasta, cereals, white rice, pretzels. Unhealthy Fats Three types of dietary fat are linked to inflammation and thus contribute to excess belly fat: trans fats, saturated fats, and omega-6 fats. Found in: packaged foods (trans fats), processed and high-fat cuts of meat, full-fat dairy, some candy (saturated fat), corn oil, grape-seed oil, soybean oil, safflower oil, sunflower oil (omega-6 fats). Milk and High-Lactose Dairy Foods One of the most cutting-edge components of the 21-Day Tummy 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).