I agree that with the current economic situation, quitting your job could be very risky. Couple that with your age and I don't think it's a viable solution. Also, a prospective employer might consider the reason you took off as being frivolous and it would be a further black mark when trying to re-enter the job market.
What will you do when you go back to work and you no longer have all the extra time to cook?
Better to learn how to incorporate exercise and healthy eating into your current schedule.
"To give anything less than your best is to sacrifice the Gift."