If you want reccomendations about your health, talk to a doctor. What the hell does the government know?
It's possible to change your habits so that you're more active and eat better, but relying on willpower to see you through isn't going to do it. You need to sort of set yourself up to succeed, if you know what I mean.
If you want to eat healthier, then you need to have healthy food around the house. Don't buy a big box of Nutty Bars (god, I love those) and expect that you're not going to eat them. It's my understanding that dieting is a dead-end. Don't diet, improve your diet. You're not supposed to be hungry; you should fill up on things that are healthy.
If you want to be more active, then you need to arrange your life so that you have little choice. Get a job that's close enough to walk or bike and where the parking is shit. You'll have little choice but to be active. Or join a competitive sport if you're competitive-minded. You'll be shamed into improving your health every time you get your ass kicked.
I don't know any more than the government does, of course. I'm no doctor, and it's a doctor's advice that you should be taking. But if a little guilt gets your ass of the couch and makes you eat an apple instead of a whole goddamn bag of chips, well, so what?