I'm a pretty tall guy (194 cm / 6'4"). So the weights are probably going to sound like more than they are.
In 2010, I was 24 years old, chronically sleep deprived, obese, heavy smoker, semi-alcoholic and had serious doubts I'd make it to 30.
In 2011, I was 25 years old, chronically sleep deprived, obese, non-smoker, and had serious doubts I'd make it to 30. I weighed 140 kg (310 lbs). According to my doctor, I had the blood pressure of a 70 year old. This was me:
Spoiler:
In early 2012, I decided to go on yet another diet I had found on reddit. To my surprise, I was able to stick to it, and I lost a lot of weight. Down to something like 110 kg (240 lbs).
In 2013, not much happened in terms of weight. I did a bunch of cardio because I actually could for the first time in a long while. Mostly bike rides. But also some walking. Although, my healthy habits were offset by unhealthy habits. Net result in terms of weight and health was bupkis.
In early 2014, I decided to redouble my efforts, since it was frustrating to hover so tantalizingly close to being of normal weight. So no more restaurant food and weekly boozing. I cook my own food. All of my own food. On top of that, I've continued my biking habit. So on a squeaky 3-gear bicycle, my record distance this summer is 43km (slightly longer than a marathon). I averaged about 100 km/week during my 4 week vacation.
Anyway, today I woke up and found the scale reading 95 kg (211 lbs). 45 kg down, or 99 lbs. Either way. Wow. Great success!
This was me yesterday:
Spoiler:
You may notice the presence of such features as: A neck. And collar bones. And cheekbones. Cool stuff I haven't had in a long while

----------
So in summary: Diet is in check*, I no longer smoke, my blood pressure is healthy (125/85), I exercise regularly, and I've also started taking sleeping a lot more seriously. 8 hours per night (what I need to be rested) is pretty much sacred to me. I don't know what I was thinking burning the candle in both ends like that. Makes you feel like shit all day long D:
* still keto/low-carb. I cook all my own food, usually from scratch. No booze. No snacking. No sweeteners. I've found this a highly sustainable lifestyle. But I guess that's probably going to be highly individual what works.