Nowadays, Type2 Diabetic Mellitus (T2DM) is the most hazardous diseases in both developed and developing countries and it increases the risks of creating kidney disease, eye disease, nerve damage, blood vessel damage and heart disease. It can be controlled with proper diet and regular exercise but the people with diabetes are often failed to implement it. Emotional eating is the tendency of its victims to react to stressful, difficult feelings by eating, even when not feeling physical hunger. But the role of emotions in eating behaviour is often not addressed when discussing the diet and weight with people with diabetes. Therefore, the aim of the paper is design a fuzzy expert system for the effect of emotional eating in people with diabetes to assist the individuals. © 2020 Author(s).