When her daughter began playing soccer at age 4, Heather Mangieri would sit on the sidelines, watching. Most kids seemed more interested in picking dandelions than chasing the ball. But when the coach called timeout for water breaks, they all ran up to mom or dad for a few sips of water, even if they weren’t thirsty.

Some parents complained about the breaks, but not Mangieri, who is a registered dietitian-nutritionist specializing in sports nutrition. She was thrilled.

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