New research hints at worrisome effects of coffee and soda for kids. Even low doses of caffeine — equivalent to what you’d find in a half to a full can of soda or a cup of coffee — had an effect on kids’ blood pressure and heart rates. Caffeine slowed heart rates and increased blood pressure in all the children.  In the younger kids, gender made no difference. But in the older group, the stimulant’s effects were felt more strongly by the boys.

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