Anyone who's ever experienced the unbridled chaos of a children's party may find this one difficult to believe, but the idea that sugar causes hyperactivity was disproven years ago. In a study conducted in the 1990s, mothers who were told their children had been given a large dose of sugar rated them as significantly more hyperactive – though the kids had only been given a placebo.

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Last updated by Luke Paton.

Common food and drink myths people still believe