How Vitamins Enabled America’s Processed-Food Revolution

“Although industrial processing strips food of much of its natural vitamin content, manufacturers can add synthetic vitamins back in—and promptly start advertising everything from doughnuts to beer as filled with the ingredients essential for health. Today, celebrities swear by the miraculous powers of vitamin mega-doses, and more than half of Americans take a dietary supplement every day. But where do all these synthetic vitamins come from—and are they actually doing us any good?”