I've not always thought of my body as being something precious that I should look after - seems obvious now of course - but when I was much younger and totally absorbed in having fun, I didn't spend too much time thinking of the effect my hedonistic life might take on me. I guess that rings true for most who are 40 years old and beyond!
Every generation can remember a time when their actions (and sometimes lack of knowledge about the consequences of their choices) had a knock on effect, and left them looking back and questioning their decision making at the time. Hollywood in the 1930's made smoking glamorous, but we know now how detrimental it is on our health. Promiscuity in the 60's, 70's & 80's became a death defying game of Russian roulette according to the statistics and scaremongering TV campaign of 1988 aiming to raise awareness of HIV/AID's with tomb stones falling over and the voice over man saying, "Don't die of ignorance!" I speak with people all the time who have beaten themselves up over life choices they made at a time when they were young, naively getting on with making choices based on, what was often, a very limited knowledge. If you're living differently now, you've learnt and evolved, you've made mistakes and you're now making better choices. Give yourself a break, don't keep letting your thoughts about the past put you down, celebrate that you're looking after yourself now!
"Take care of your body it's the only place you have to live." - John Rohn