Nutrition apps can help build healthy habits. For some users, their gaming features carry risks

Nutrition apps can help build healthy habits. For some users, their gaming features carry risks
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By ALBERT STUMM The Associated Press Green means go, red means stop. Trophies or confetti come with good performance, and people who fall behind get nudged to do better. Those brightly colored engagement tactics long ago jumped from smartphone games to everything from online shopping to sports b...