How do you do? <a href="http://www.unfoldingleadership.com/blog/index.php/hurleydrugstorecom-5a25.pdf#bruise">drugrehabconcord.org</a>  HOBSON: They all sound like they're going to work, don't they? Well, people often bounce from one diet to the next. Researchers spend a lot of time and money trying to figure out which ones work best. But a provocative paper out in a leading medical journal says we should stop doing research comparing various diets altogether. Carey Goldberg, health reporter at WBUR and co-host of the CommonHealth blog, joins us with more. Carey, welcome back.