Yeah, in the 70’s I remember my older sister being on a new fad diet and going to the gym was popular for women. My sister diet was eating no more than 1200 calories a day and the way most of the girls did it that way back then was eating lettuce and tomato sandwiches. No meat and no condiments like mayo or ketchup. Just a tiny bit of mustard. Also meat was expensive and it was believed that meat was mostly necessary for men because they had muscles and needed the protein. Tuna and cheese and salads were what women were expected to eat because they didn’t need to build muscles. Just get rid of unattractive fat. Men needed starches and meat.