Here is a timeline, as best as I can recall without doing any pesky research, of public health advice from the Media:
1950: Meat, starch and dairy will keep you healthy.
1962: Make your kids drink juice. It has vitamins.
1965: Mercury is good for your teeth. Fill your cavities with it.
1969: Eat wheat germ to be groovy.
1973: Bread is a wonder food. Replace all meals with bread.