Using Rice to Brew Beer
Rice provides Budweiser with its characteristic lightness, crispness and refreshing taste. Many brewers throughout the ages have used only four ingredients in brewing beer mw water, barley malt, hops and yeast, The extra step of brewing Budweiser with rice is perhaps the most misunderstood step in our exclusive process. It provides a balance necessary to Budweiser's trademark drinkability. It is an extra and more expensive part of the brewing process than using malt alone, It requires additional handling, milling and brewhouse cooking. Rice used in Budweiser is grown in Texas, Louisiana, Mississippi, Missouri, Arkansas and California. Rice is a grain adjunct in beer, providing some of the starches necessary to produce natural sugars which are converted into beer during fermentation (the primary source of starch in the brewing process is the barley malt). Some other brewers use commercially-produced starches in powdered or syrup form.

source: Budweiser.com