Fiber supplements can cause abdominal bloating and gas, at least initially. Fiber supplements can also reduce blood sugar levels, which may require an adjustment in your medications or insulin if you have diabetes. If you plan to take fiber supplements, start with small amounts to minimize problems with gas.Click to see full answer. Similarly, you may ask, why does fiber give you gas?Increased gas (flatulence) is a common side effect of high-fiber diets. The gas occurs because bacteria within the colon produce gas as a by-product of their digestion of fiber. Some types of fiber are digested to a greater extent by colonic bacteria than other types of fiber.Likewise, do fiber supplements make you poop? Then try foods that contain psyllium seed husk, bran, and methylcellulose, or try fiber supplements. These natural products increase stool weight and have a laxative effect. Be sure to drink a lot of water when taking any of these products, as they can clog up the intestines and cause constipation. Herein, what are the side effects of taking fiber supplements? Too much fiber can cause: bloating. abdominal pain. flatulence. loose stools or diarrhea. constipation. temporary weight gain. intestinal blockage in people with Crohn’s disease. reduced blood sugar levels, which is important to know if you have diabetes. How do you prevent gas from eating high fiber?If you’re already overwhelming your gut with fiber, cut out other foods that create gas. Try limiting or avoiding sugar-free candy and gum that contain sorbitol and gassy carbonated beverages. Load up on water. Staying hydrated and drinking plenty of water will help to prevent uncomfortable intestinal gas and bloating.