In the end it's the parents making the buying decisions. I have a 2 week rule with my 7 and 5 year old. Take-out food once every 2 weeks (usually every second Friday). With very few exceptions, but relaxing the rule, say on vacation. Both children are very active in sports, both organised and at home and they have no problem with the 2 week rule as that's all they know. Now for me? Do as I say, not as I do.