College in the USA. I've gone several days without food, simply because I could not afford to buy anything to eat nor did I have transport (or money for transport) to buy/procure any.

I've also gone several days without food while sick. For me, these two things were QUITE different. Being too sick to eat sucks because I was sick and feeling so bad that hunger didn't register. But being otherwise healthy, but having no access to food is something else entirely.

It was like a day before my every waking thought somehow revolved around eating and food, almost feels like being mentally ill. Every thing you think about turns into a tangent, memory, feeling about food. Hard to describe and it's been so long, that fortunately it's a foggy, distant trace of a memory. Just still remember that I couldn't focus on anything worth a shit because any semblance of a thought process would devolve into food and eating.