<human>: Give me the gist of the text in a nutshell

I've been friends with "Ash" and "Kate" for about five years now, so I've been around to see their children [8M, 5F, 3M] grow up. They do a good job of raising them, though both of them refuse to discipline the kids. Kate doesn't want to be the nagging mum stereotype and Ash says he works so much that he wants to be "fun dad" when he's with them. It doesn't seem great but the kids have always been so polite and well behaved that everybody's just gone with it.

However, now the kids have started gaining a LOT of weight and I'm having a hard time not stepping in. I was an obese child and it was hard to change when I grew up. It's not a small amount of weight either. Both parents are thin and the kids matched this until about a year ago when Ash got a more demanding job. Now the two oldest kids have large, overhanging stomachs and completely round faces. The youngest has just started visibly gaining too, though he isn't as bad yet.

It was Kate's birthday last weekend and Kate happily piled a plate full of food for each of them. The closest thing to vegetables was a potato bake and each kid had two serves of cake. I don't know what to do. I'm fairly close to them, but I'm childless and I don't know if it's my place to talk to others about their kids. Should I say something? I worry about their health every time I see them.
<bot>: Friends are overfeeding their children unhealthy food and it's led to the kids gaining a lot of weight quickly. Is it my place to say something if I'm worried?