Glad I found this thread. I'm into my 6th full week of commuting, and 4th full week of going to the gym for a swim along the way. I am famished all day long, and feel like I keep nibbling all the time.
I typically don't eat before I leave the house, except maybe a banana, but have a decent sized bowl of oatmeal when I finally get to the office. I will add a piece of fruit afterwards, then a lunch which more times than not is nothing but fresh veggies and a (very) small amount of protein, such as salmon, or left over steak or pork chop. I also keep some fresh almonds at the office, a jar of PB and J in the fridge. When my body says it wants something, I obey. I'm no skinny minny. When I started this I was 250 lbs. Haven't noticed much weight loss yet, but I've dropped about 4 inches from my waist, so the nibbling isn't doing me any harm, I guess.