This news seems to fall into the endless game of setting one generation against another. I'm more indulgent with my grandchildren than I was with my own children. When they were small they had sweeties on Friday only, never when out at the shops. I'm guilty as charged of allowing the youngsters to chose one small bar of chocolate or small pack of sweeties if they've been round the supermarket with me and does as requested, stayed with me.
Ours come to the park for the dog walk, we go to those soft play activity centres, swimming etc and in the summer, they're out in the garden racing about all day. The odd biscuit at 11 am or 3 pm isn't going to destroy their otherwise healthy lifestyle is it.