Fat parents are bad parents!?!

I've heard this before and it is making me really doubt myself and my husband. We are both overweight and we can decide whether it is smart to have a child or not. We don't want the kid to go through the same issues we did with weight. Of course we lead healthy lives and will continue to do so but what about the genes? What about the fact that I wouldn't be able to run around as much with the child or the fact that my husband's weight would keep him from being active with the kid? Thoughts?