People tend to waste money and food! Teach your Child well...

Start teaching your children about money and food value early. It's important to help them understand the value of money and food. Starting around age 10, give them a few dollars every week to spend on a favorite snack or desert food and also an item that is healthy; not processed, not sugary and from one of the more nutritious food groups. * See food pyramid on the side bar on this blog.

Make their allowance dependent on the doing household chores (cooking and cleaning in the kitchen) and let them choose what they want to do instead of assigning work. They’ll soon learn that if they spend all their money on just a couple of things and then eat it all in one day or as soon as they get it, they won’t be able to afford any more until the next payday.

This strategy is to teach them about food value for money which is about frugality in making wise food choices and or using one food item a number of different ways. Start teaching them early about the importance of food groups and managing a balanced diet within a budget. 

This way, they won't waste food nor eat junk food and they will eat what they put on their plate and appreciate the value of it in terms of expense and nutrition for their mind and body.

*Source ~ https://childdevelopmentinfo.com/ages-stages/teenager-adolescent-development-parenting/teens-money/#.Wz-92Jonapo