1930s - H.K. Stiebeling Diet 12 food groups: milk (2 cups a day); lean meat, poultry and fish (9 to 10 servings a week); beans, peas and nuts (1 a week); eggs (1 a day); flours and cereals (as desired); leafy green and yellow vegetables (11 to 12 a week); potatoes and sweet potatoes (1 a day); other vegetables and fruits (3 a day); citrus fruits and tomatoes (1 a day); butter (no specification); other fats (no specification); and sugars (no specification).