Do you see what they eat at home?
I have a question - why do you assume that what they are eating out in public, is what they are being feed at home, and why do you assume that all "fat" children are being overfeed and eating the wrong foods?
Has it ever occurred to you that maybe their parents are allowing them a treat while they are out? Or maybe they should deny their children the right to experience a treat in a public place just to satisfy your visual judgements.
Next time you're out and you see a "fat" child with a "fat" parent, why don't you go up and talk to them..... Maybe that child has a thyroid problem, or an advanced growth issue - like my own daughter who I am constantly have to defend - because she happens to have a genetically passed down advanced growth where she is 2 years ahead of her age. Until you know the people and they way they truly live, you cannot make judgements and put everyone into the same basket, it is not only irresponsible of you, but it is also extremely rude to post such a knee jerk response before you actually have all the facts..children her own age - I am apparently over feeding her and feeding her nothing but junk food - which is on the contrary! However I do know that to teach your children good eating habits you need to allow them to experience every facet of food, because if you completely deny them "junk" food when they are older and the parent is no longer in control of their eating habits - they are going to gorge themselves on what they have missed out on.
Signed - Mother of a "fat" child