Reuters - Falling levels of a hormone called leptin that helps the brain resist tempting foods may explain why people who lose weight often have a hard time keeping it off, U.S. researchers said on Friday.

AP - There may be a break in the salmonella case: Food and Drug Administration inspectors headed for farms in Florida and Mexico on Friday, as new clues emerge to the possible source of salmonella-tainted tomatoes that have now sickened 552 people.

AFP - The number of girls under the age of 14 having an abortion jumped by over 20 percent in 2007, new figures from the Department of Health show, leading to calls for more government-backed sexual health counselling and contraception services.

AP - Doctors who treat the kinds of knee and leg injuries that ended Tiger Woods' victorious season have one word for his U.S. Open victory — remarkable.

AP - Doctors have long suspected that people with herpes are more likely to catch HIV. So they thought that by treating herpes, they could also cut a person's HIV risk. But a new study that tested this strategy found the assumption may have been wrong.

AFP - Pneumonia and diarrhoea, which kill one in three children around the world, are emerging as key concerns in disease prevention, a public-private partnership said Friday.