nick get in the gym,. put on some muscle.
I understand where Nick is coming from though. I was always on the skinny side of things through high school and much of college. In my late teens and early 20's, I was around 160 lbs, at 6' 4". Now, close to the end of my 30's, I'm around 210, from hitting the weights on and off for the last 15+ years. I'm far from toned though and plan to see what I can shed before July. But right now it's bulk up time.
(I mean no offense to Nick. I completely understand and many people don't know just how difficult it can be for thinner guys to gain weight. And of course, some thinner guys just don't care to put on weight, and that is fine too.)
For the vast majority of people (excluding those with other underlying health issues), to gain weight, eat more calories than you burn; to lose weight, burn more calories than you eat. Very simple arithmetic but much easier said than done on the weight loss side of things.
Don't look at it as dieting; look at it as a lifestyle change, it
has to be, or it will all come back.
Damascus said:
By this time next year I will be a different man, no doubt about it.
^This.
This is what kept me getting back into the gym. There have been many times where it's been a couple of months or a year (perhaps more) that I wouldn't be in the gym. Then I would look back at what I had lost and think, "If only I hadn't stopped, not only would I not have lost the muscle mass, I would have been that much bigger." Keep in mind what you will be thinking this time next year if you stick to it. You will likely regret it if you stop.
It is generally understood that the first 3 months are the hardest. You need to keep going and get your body and mind in the habit. If you can, get a partner to go with. If your doctor okays it, hit the weights. Increased muscle mass will burn more calories. If you hit the weights, definitely try and get a partner who knows what they're doing or, if finances allow, get a personal trainer, even if it's just for a few sessions.
A year from now you'll be looking back at this time. Keep that in mind every day.