it's not for everyone and I cannot stress this more that you should most likely talk to your physician first but I did the Slow Carb Diet to slim down. It's a diet outlined in the Tim Ferriss book The 4 Hour Body and it works wonders. I am now in maintenance mode and have been doing it on again/off again since I lost the weight. But at my heaviest I weighed in at 260 lbs, I was 160 in HS. I've slimmed down to 175 since then and have kept it off with a regimen involving doing the diet again when I need to cut, living a more wholesome lifestyle with my food choices, and exercise.
I've done alot, been on Weigh Watchers, Jenny Craig, that Dan Marino diet... nothing worked like Slow Carb.
here's my before and after (sorry my after is pretty blurry... what can I say.. Vegas...)
here are some links to follow!
http://fourhourbody.com/
http://4hourpeople.com/
the best advice I can give you is to start... just start... it's always too late if you keep saying "Monday"
Also, set small/reachable goals... eventually those little goals will amount to one big goal.
Good Luck and stay Active... Get Lifted.