Even when trying to lose weight, I will eat some regular (not low-fat) yogurt or p.b. in the morning before I commute. When I get to work I am not starving, and it is easier for me to eat responsibly (not that I always do, but it is easier.)

If you do decide to get some shorts and/or tights, go to bicycleclothing.com or aerotechdesigns.com; they have bigger sizes. The lycra pants fit well (bikers tend to have bigger thighs and butts). I get all shirts from the Big and Tall store (they are now carrying wicking shirts in the big sizes).