Hi Mike, you have definitely picked a good way to shed weight. I'm often a 10pm or later runner too, you are not alone!
In early 2004, I was 26 and hadn't really exercised hard for 5 years. I was on my feet all day for work and lifting a lot of very heavy stuff about, so I was big and strong, but fat and unfit with it - 17 and a half stone and a heavy smoker.
I quit the fags, and a couple of weeks later, I went for a run. To cut a long story short, by the end of 2006, despite having had a really long break in training (a big chunk of this was due to injuries sustained banger racing rather than lack of motivation), I was running a good 25+ miles a week and weighed about 12 stone.
A new relationship distracted me from running for a while, but we're engaged now and we run together. I've been into/out of running over the intervening years and weight has fluctuated a bit, although never to the previous level of excess.
My brother has had a similar but more extreme experience. He was really fit in his teens and early 20’s – he ran a gym at one stage, then the shift work disrupted his eating and exercise patterns, and he got unfit and overweight to the extent that his BMI was into the severe obesity range. He came out to jog a couple of miles with me at some point back in about 2008, despite tipping the scales at over 19 stone, it was mind over matter, he couldn’t speak after a mile, and probably sweated 2 pints. I think I could walk just as quickly as we jogged to be honest! However, by late 2009 he had shed 5 stone, and completed the Great North Run. He went on to run the 2010 and 2011 London Marathons - although he did put a stone on in a week after the last one pigging out on holiday in the USA!
As somebody who started running when terminally unfit and clinically obese, the best bit of advice I think I can offer you is about your question about getting out of breath.
As 'Run Wales' has said, your heart and lungs are what is restricting you at present, once you fix that, the next restriction is your legs, then you need to look out for injury. So, the first challenge is to get fit enough that your legs are what is stopping you going further. This requires you to endure a bit of discomfort and apply some mental toughness. If you go and jog at the moment, you'll soon find that:
a) sweat starts to bead on your forehead
b) you are panting and struggling for breath
Your body will be screaming at you to stop, and you will. Sooner or later, you'll need to be able to make yourself confront your urge to stop, in order to make real progress, you need to find your 'second wind'. As far as I know, no matter how fit you get, you will ALWAYS have a moist forehead and generally be 'feeling it' on the breathing front at some point into a run where you are doing anything like your best pace, and when you're unfit, a jog is the best pace you can hold.
My approach was to pick a distance and jog it - initially, it was only about 800m, and I was flat on my back grunting like a pig for 10 minutes afterwards. The next night, I made myself do it faster. I think when starting from the couch, you need to ensure that you are tough on yourself and push towards goals and make progress - you have to get through that barrier somehow, it gets way easier when you do - that's when the injury risk 'Run Wales' describes kicks in!
Edited: 06/02/2013 at 22:53