Best way is to eat small meals every 4 hours. That increases your metabolism and makes your body digest faster. Plus eating more veggies instead of bread/rice. Walking a whole lot is already exercise, and bringing lots of stuff if you're going to work making you sweat and pant, that's already exercise. Make use of these little ways to motivate you to start exercising cause that is the best way.
Plus if you start exercising you get to eat more without having to eat less.