Dr Sarah Schenker is a registered dietician and is on hand to talk to you about gluten. Gluten is a protein found in grains such as barley, wheat flour, oats and rye. By dramatically reducing gluten in the diet, people often report less bloating and lethargy. But Dr Sarah advises if you do opt for a gluten-free diet, make sure you are choosing whole-grain and naturally gluten-free foods, rather than processed alternatives.