low carb pita bread and breads made of all sorts of things like rice or quinoa, there was Hollywood Diet Bread. Yet another product I remember my mother buying, when I was a kid. I had no idea that it had "eight fresh vegetable flours" in it or what that really means (seriously, flour made of lettuce? of celery? huh?). I remember that it was very thin and had sesame seeds on the outside.
The large ad on your left is from 1964 and the lady in the white Rolls Royce convertible who is eating (rather precariously) on the go is Eleanor Day, the inventor of Hollywood Diet Bread. An inspired name, because it evokes glamor and movie star svelteness and - yes, the idea that maybe you too could ride around in a white Rolls Royce convertible, looking like an attractive model in a fur coat, all the while eating a half grapefruit (I think that's what she has there, along with coffee and tomato soup).
In 1962 the FTC investigated the National Bakers Services company that made the bread, saying that the only reason it was fewer calories than normal bread was because it was sliced very thinly. There were diet booklets and a Diet Control Plan written, ostensibly, by Eleanor Day (though the trademark information suggests that she was, like Betty Crocker, a creation of the manufacturers`imagination). Eleanor naturally thought that your diet plan needed to include her bread at every meal. My mother just made sandwiches with it, though.