(This story has been posted on The Wall Street Journal Online's Health Blog at http://blogs.wsj.com/health.) By Jonathan D. Rockoff Here's what's making health news this morning: Not All Calories Are Equal, Study Shows (WSJ): A study comparing three diets found that the best one for keeping weight off while avoiding unwanted side effects is based on healthy carbohydrates such as fruit, vegetables, nuts and whole grains. Wal-Mart Lags in Clinic Race (WSJ): Five years ago, Wal-Mart pledged to open as many as 2,000 of these clinics in its stores by this year, but it only has 149 operating in the U.S. and closed 33 this year. Walgreen, Others Offer Free HIV Tests in CDC Pilot (Reuters): Several Walgreen and other pharmacies are offering free and fast HIV tests under a $1.2 million pilot program funded by the Centers for Disease Control and Prevention, which aims to use lessons learned from testing to establish a model for detecting the virus. FDA Hearing to Focus on Replacement Hips (New York Times): Better monitoring of all-metal substitute hips will be discussed during the two-day meeting following thousands of premature failures. Shark Oil for HIV Shot Takes Cue From Hemingway's Old Man (Bloomberg News): Novartis's shark liver oil boosting agent is being added to Sanofi's ALVAC vaccine in an attempt to maintain immunity longer. New Rules Will Ban ER Debt Collections at Charitable Hospitals (Kaiser Health News/NPR): The U.S. Treasury released proposed new rules required by the 2010 health-care-overhaul law to guard patients against aggressive debt collection by nonprofit hospitals. Doctors Should Screen All Adults for Obesity, U.S. Panel Says (Time's Healthland blog): The U.S. Preventive Services Task Force recommended in the Annals of Internal Medicine that doctors measure all adults' body mass index during physicals. -For continuously updated news from The Wall Street Journal, see WSJ.com at http://wsj.com.