The first reply had it pretty much bang on (although I don't believe cutting out red meat makes much difference). Everyone knows how to be healthy, it's just nobody can be bothered to do it. We all know alcohol, sweets, fizzy drinks, fast food etc... is bad for us.
I firmly believe that for every man (and most every woman) to get the body you want you will need to gain some muscle. Low body fat is good, but without muscle it just looks horrible.
Hit the gym, lift weights and do some cardio afterwards, eat a calorie deficit and you will lose weight.
The best thing is to post a picture of your goal physique and what you currently look like to see what you need to do. Even if you don't want to post it, it's always nice to have a 'before' photo