How can I be still hungry after spending $800 a month for food?

I skip breakfast so I can avoid roommates in the morning and wake up at noon and eat catered lunches and I have canned spaghetti for supper and a power/fiber 1 bar… I eat two chocolate bars and I drink milk and pop through the day. Sometimes I order out on the weekend a pizza or hot dog… Every Monday I spend $5 – $10 for hospital café food ( one or two kubasa and juice) Some times I eat oatmeal crisp cereal. I’m living on my own for the third time in my life, away from parents… I don’t smoke or drink anything other than milk, water, pop and juice. I am just getting over pneumonia, from avoiding ordering out and sleeping in for three days and not eating to save money. I am going through massive weight losses from 350 pounds down to 236 today.