Some experts believe tuning into podcasts that give advice on diet and exercise help people lose weight, but only certain kinds.

Boring health lectures are a good start, but informative and entertaining soap-opera-like podcasts stick with you, and offer better results.

I guess it's like those tapes that teach you another language while you sleep. Miguel buys fish at la pescaria.

Writing in the American Journal of Preventive Medicine, researchers found overweight and obese men and women listening to weight-loss podcasts, 15 to 20 minutes long, for 12 weeks, lost six pounds.

But men and women listening to entertaining or enhanced podcasts lost weight, plus it encouraged them to eat more fruits and vegetables, do more exercise, and gave them greater satisfaction with the weight-loss intervention.

Have you tried any of these? I see a lot of people at the gym with MP3 players strapped to their arms, now I wonder what they're listening to.