you don't need to eat ramen. there are many cost effective options out there: oatmeal, beans, rice, you could grow your own fruits and vegetables, etc.

and as for the medical disaster: heart attack and stroke are actually preventable with a plant based diet (keep your LDL under 80 and you'll vastly decrease your chance of a heart attack). i know a lot of people will hate on that, but those are the facts and any evidence based nutritionist can tell you this.