Ideas about food and healthy diet were very different in the 60s. They were better.
A Mars a day helped you work rest and play. Guinness was good for you. And when you were ill you drank Lucozade because sugar was medicine when it was wrapped in Cellophane.
Food was more fun when it was in Technicolor. Everyone knows salad is boring and baked beans are groovy, so why not transform a fridge full of useless lettuce, radishes and eggs into a delicious piping-hot baked bean surprise?