What happens to you if you don't eat enough bread?

Bread is not a necessary part of human nutrition. Lots of people never eat any bread and are perfectly healthy. You do need some amount of calories in your diet, but these calories can come from many different sources: bread, pasta, rice, oatmeal, etc. Bread is also a source of the B vitamin complex, but then, there are also other sources of B vitamins. Liver is particularly rich in B vitamins.