Typhoon: your brother... talk about someone skinny!!!
That said I am a small guy, small frame etc. Back in college I was only 118-125 but within 3 1/2 years of airline flying was up to 150. Doesn't sound bad but it was all "tire." I finally said enough is enough on Jan 1st and cut out all non-diet soda, juice, etc. I am doing a 1200-1400 calorie a day diet which I carefully mointor and to try to get more complete meals when I am on the road I use "lite" protein bars to replace meals when I don't have access to something decent. I eat tons of grilled chicken, turkey, salads etc. with no mayo, fatty dressings etc. No fries or deserts either except maybe a "free" meal every 2 weeks. I do 6 days a week of 30 minutes of aerobic exercise and use the treadmills in the hotels or just run outside. In about 9 weeks I have lost 20 pounds and am down to 129 with a goal of 124 to go. Then I hope to put some weight back on in the form of muscle in a more intense weight training routine with higher daily calorie levels.
It is working and I feel SO much better.