S!
There are 2 extremes, the obese and the superskinny. For example at work the physical test tables favor you if your weight is low. Let's take an example. 2 persons 180cm tall(roughly 6ft), one weighs 90kg and other 75kg. They both get same results in the physical tests but which one gets better score?

Is the heavier guy in worse condition even he with 15kg more did the same?
But as EZ pointed out, the size of products have gone up over the last years. When I was a kid we were happy to get a small 100g candybag to share with my sisters. Now one kid eats these Mega bags of 400g! There are burger and pizza joints everywhere and their advertising strikes the young most and they also target small kids with their happy meals and whatever. I VERY rarely take my son to a burger joint, he eats normal home made food. And it is not that time consuming to make something, just plan a bit ahead
I had a period where I noted my weight went up, no excuses. Now I have been working hard to get it back down and more than happy with this decision. Feeling much better and I can do more. Key word self discipline

I do not want to be a walking heap of fat..