You've got to make it a good example for those kids regardless of how much you mess up.
I was this role model for heavy people. But the thing is, I never set out to be a role model at all, and I don't set out to be one now. I won't preach to anyone and tell them how to lose weight. I don't know any better than the next person.
Practical gifts are another great way to be thoughtful, and they work for anything from birthdays to dinner-party gifts.