The U.S. Food and Drug Administration released draft guidance on Wednesday recommending that dairy alternatives like almond, soy or oat milks disclose that they may be nutritionally inferior to cow's milk. Doctors, too, say plant-based milk alternatives aren't always the healthiest choice, especially for children. The FDA guidance comes as grocers offer dairy alternatives made from an ever-expanding assortment of nuts, cereals and other plants, including coconuts, hemp, oats, peas, quinoa and rice. Worldwide sales of alt-milks are growing steadily, driven both by the needs of consumers who have an intolerance to cow's milk and the desire of some to reduce the environmental impact.