Gastritis Diet: Diets for Medical Conditions : Gastritis Diet. If a person experiences gastritis or heartburn, they should avoid caffeine and acidity, as well as spicy foods. Discover how smaller, more frequent meals can help an individual with gastritis withhelp from a registered, licensed dietitian in this free video on diet and gastritis. Expert: Charlotte Lawson Bio: Charlotte Lawson is a licensed and registered dietitian and nutritionist who graduated from Michigan State University with a Bachelor of Science in dietetics and health promotion specialization. Filmmaker: Christopher Rokosz Series Description: Having certain medical conditions can also require an individual to have restrictions on his or her diet. Learn to eat the right way with help from a registered, licensed dietitian in this free video series on diets for specific medical conditions.