A small amount of oil or another fat such as butter or ghee is the ingredient most commonly used to help prevent rice from becoming gummy when cooking. Oil coats the surface of each grain, reducing the tendency of surface starch to bind adjacent grains together. Practical cooking guidance from J. Kenji López-Alt of Serious Eats emphasizes removing surface starch by rinsing and using a film of fat to keep grains separate, while testing from America's Test Kitchen with Bridget Lancaster shows similar benefits when preparing pilafs and other non-sticky preparations.
How the ingredient works
Rice becomes gummy because starch granules absorb water and swell, then release amylose and amylopectin onto surfaces where they form a glue-like network during and after cooking. Harold McGee author of On Food and Cooking explains starch gelatinization as the fundamental chemical process behind that behavior. Adding oil changes the interaction at grain surfaces so that released starch is less likely to create continuous bonds between grains. At the same time, rinsing rice before cooking removes loose surface starch that would otherwise dissolve and increase stickiness, and the combination of rinsing plus a small amount of fat is effective for producing separate grains.
Cultural and practical nuances
Different cuisines expect different textures so preventing gumminess is not always desirable. Short-grain varieties are prized for their cohesive texture in dishes like sushi and certain East Asian rice bowls, where stickiness is culturally essential. Conversely, Middle Eastern pilafs, Indian biryanis and many Southeast Asian dishes value distinct, fluffy grains; traditional recipes often use ghee or oil early in the cooking process for exactly this reason. Environmental and practical considerations also matter: rinsing consumes water and some regions prioritize minimal water use, so cooks may rely more on fat and precise water control when resources are limited.
Consequences of ignoring these controls include a dish with poor mouthfeel, diminished presentation and potential incompatibility with the intended culinary style. Applying a small, measured amount of oil together with proper rinsing and attention to water ratio offers a simple, evidence-backed way to reduce gumminess while respecting regional cooking goals.