I'm 12 and I want to try protein powder - should I?

Twelve-year-old Ben is desperate to try protein powder but there's one hurdle: me, his mum.
"I've asked about 20 times and you just keep saying no!", he says, claiming it would make him "fitter and bigger" and that his male friends use it.
In recent years, there's been an explosion of products marketed as "high protein", including milk, yoghurt, breads, cereals, bars and powders.
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