The Diet Watcher Workshop came to my small town in Calif in 1970 and here is the diet:
Breakfast was either 1 egg, 1 slice of toast or 3/4 c. dry non-sugar cereal and 1 oz. of chicken, fish or cheese.
Lunch was either 2 eggs or 2 oz. cheese or 4 oz. fish or chicken and 1 slice of bread.
Dinner was 6 oz. chicken or fish and 4 oz. vegetables (cooked).
Adults were allowed 2 cups of nonfat milk a day and 3 pieces of fruit. Coffee, tea and diet sodas were allowed freely. Fruit like bananas and watermelon were only allowed once per week. Vegetables like potatoes were only allowed once per week, same with pasta (and these were used as a bread substitute). Teenagers and children were allowed 1 quart of nonfat milk per day and 5 fruits.
Some foods were allowed freely--certain non-root vegetables like salads, diet jello, and a thing called Free Soup which was made with tomato juice and cabbage and bean sprouts.
Fats were pretty much restricted.