Yes, we all grew up on butter and sugar and there was not so many overweight kids.It must be something else...
Today's food is not healthy because of all those hormones, antibiotics, additives, colors, pesticides...and God knows what else they are using in the process of making food to get better profit. Not to mention GM food.Incredibly I can see here how even Chinese people are getting fat even they tend to still eat their food that never before made them fat.But they are using same ( Australian) ingredients.Ad to this that we are not walking anywhere today ( kids too) and it's a disaster.I don't see how this will change. Organic food for masses? I don't see this.
But did you watch documentaries?
First about why in developed societies ( and even China) people are having less and less children...and where it is leading when birth rate  falls to 1.2. They say that societies that reached this point will literally disappear...like Italians for example.
People in their 30s can hardly find partners, especially girls are not able to find partner willing to commit in this age and girls biological clock is ticking ...not that the man will really settle down and easily find partners after 40 and they expect it. That's one side of the coin.
Second documentary is about aging people that soon will make 50 % of the population in many societies...sad and interesting staff. I would like you to have a look at this documentaries...and comment.
   

Science without religion is lame, religion without science is blind...Albert Einstein