Brewing is used to convert the starches in the malt to sugar, which is then usable by the yeast later in the brewing process. Doing the latter rest at the lower end of the range favours β-amylase enzymes, producing more low-order sugars like maltotriose, maltose, and glucose which are more fermentable by the yeast. This in turn creates a beer lower in body and higher in alcohol. A rest closer to the higher end of the range favours α-amylase enzymes, creating more higher-order sugars and dextrins which are less fermentable by the yeast, so a fuller-bodied beer with less alcohol is
Low-alcohol beer brews used at festivities. More recently, the temperance movements and the need to avoid alcohol while driving, operating machinery etc led to the development of non-intoxicating beers. In the United States, non-alcoholic brews were promoted during Prohibition, according to John Naleszkiewicz. In 1917, President Wilson proposed limiting the alcohol content of malt beverages to 2.75% to try to appease avid prohibitionists. In 1919, Congress approved the Volstead Act, which limited the alcohol content of all beverages to 0.5%. These very low alcohol beverages became known as tonics, and many breweries began brewing them in order to stay in business during