Trending "Check the label to see which enzymes are included and their source, particularly if you’re vegetarian or vegan," advises Holland and Barrett. "Also check which food they break down inside the body – if you have lactose intolerance, for example, look for lactase." How do I know if my bloating is caused by a food intolerance? According to the NHS, food intolerance can lead to bloating when: Your bowel does not empty properly The food causes gas to be trapped Too much gas is produced as a reaction to the food. "The most common foods to cause problems are wheat or gluten and dairy products," explains the health body.