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Many new fitness-tracking devices are on display at the Consumer Electronics Show in Las Vegas.
Engineering mice with a fat-burning strategy from bacteria keeps the animals thin.
Monitoring acetone in breath could tell dieters whether their efforts are paying off.
A startup blends activity tracking with online incentives in hopes of getting kids into shape.
The weight-loss results have been modest, but the new compound appears to be safer than previous drugs.
Drugs that block blood-vessel growth could tackle obesity.
Data from 100,000 people’s ratings and shared photos of 500,000 meals suggests mobile apps could nudge us toward healthier food choices.