In my 20's and recently, I had to live off little money. In my 20's it was tins of tomatoes, tinned mackerel on toast or a stir fry with an onion, a carrot, a few beansprouts and a chicken thigh and a large portion of white rice with egg plus half a pint of milk a day. Mackerel in tins was edible then. My skin was much improved. I hadn't the discipline the second time.