Since I want people to see how beneficial it's been, I'll share in spite of myself. I'm down 31 pounds in 13 months, and the only change is the walking. I eat and drink whatever I want, and when I started to plateau a bit, I just started doing harder walks; up more hills and steps instead of just going further.
I didn't really feel like sharing the details, but I definitely want people to know that walking is pretty awesome. I can always tell a lot of people don't take it very seriously as a form of exercise, but it suits me just fine.