1933: Kellogg's Diet
Food brands started to realize they could sell more of their products if they gave them a dietary spin. Enter Kellogg's 1930s campaign, which claimed there was a "beauty-parlor in your kitchen."

"Powders and creams are delightful aids to beauty. They will do wonders — if you start with a healthy body," the campaign shares. "For health, itself, is the source of sparkling eyes, of a smooth, lovely skin and an engaging personality. Bran helps."