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Oh Dear Things have changed since I was at school too. Vending machines should be banned. Food technology lessons promote calorific foods. If they don't have have crisps and sweet snacks in their packed lunch they are available to buy so that kids don't feel left out or get teased for just having fruit. Regarding siblings of differing weights, I agree that we can all vary slightly metabolically however it is always a basic physical equation of energy input =energy output. Even minor habits can cause weight to gradually increase over time. For people affected by weight issues they need help to address it or it will continue to get worse as they age. Parents are responsible for their children's health and I know this is challenging for some and the level of help required is not always available. I know it sounds harsh but allowing a child to become obese is tantamount to child cruelty. Some parents feed their children as much food as they want because they love them so much. It is very sad. All addictions are a state of mind, it is easy to give up anything if you want to. The problem is if you are not sure you want to.