Fast foods are also deficient in fiber and, depending on the foods, in a few vitamins, Folacin, for example, is all but absent in a fast-food meal of hamburger, French fries and shake. No authority recommends fast foods as the sole dailt fare. But if the sugary drinks are limited, and if sodium-laced seasonings are shunned, the oft-maligned fast foods meet the ultimate goals a sound diet: nutritional balance and broad appeal.