If you want to be remotely healthy, don't eat junk food. It's that simple. Because it's really not worth it (oh but it is, sometimes) when you try to burn off all those bad kilojoules you just ate. Think about the exercise! Think about the weights! Think about the cardio! Think about all that when you're about to eat a Big Mac and Fries because you need about an hour and a half of cardio or two hours of weights to whip that out your system. There's a workout plan in the infographic below from Buddy Loans to show you how to combat the issue of fast food, or you could just not eat it (eat it! eat it! eat it!). This graphic is in calories, but the exercises are obviously the same whether you eat in imperial or metric.