Firstly, I wouldn't suggest hitchhiking to travel from place to place - it is very dangerous.
Secondly, what he eats is not healthy. He needs a more balanced diet.
Thirdly, he says that people don't need air-conditioning or a heater. Well, I've slept in my SUV a few times (parked outside our driveway) and at nights when it was only 60 degrees, the car got really freezing inside and I found it hard to sleep. And in the morning when the sun came up and it warmed up, the car got really hot inside so that I couldn't sleep inside it anymore and went back in the house to continue my sleep.
Fourthly, he could have saved himself all that problem and just lived in his parents house until he payed off his debts - alot of young people are doing that today.