Variations in a dopamine gene may boost motivation to eat and could make food addictive, obesity experts report in Behavioral Neuroscience.

  In the journal Nature Medicine, scientists report promising results from a blood test they're developing to predict Alzheimer's disease.

  People may overestimate their nightly sleep time by as much as an hour, sleep experts report in the Journal of Clinical Sleep Medicine.

  Nearly one in five who seek bariatric surgery to treat obesity aren?t psychologically prepared for such a drastic step, according to a new study.

  The survival rates 10 years after coronary artery bypass surgery and angioplasty are similar, according to a new analysis of nearly 10,000 heart patients eligible for either procedure.

  Eating garlic may release compounds in the blood that relax blood vessels and increase blood flow to lower heart disease risk.

  People who suffer from common gastrointestinal disorders such as irritable bowel syndrome (IBS), constipation, and acid reflux often find it hard to get their work done, researchers report.

  Obesity more than doubles a woman?s risk of developing colon cancer or growths that can lead to colon cancer, researchers say.

  People are more likely to act on what they hear through gossip than what they see with their own eyes, researchers say.

  Whether you're allergic to peanuts or dairy products, experts offer strategies for dining safely at restaurants.

  An initial colonoscopy during which the colon is cleared of precancerous polyps significantly reduces deaths from colon cancer -- even if there are no follow-up exams, researchers report.

  Medtronic has recalled its Sprint Fidelis defibrillator leads. Patients with the heart device should talk to a doctor, says the FDA.

  Roughly one in seven adults who fractures a hip later has a second hip fracture, experts write in the Archives of Internal Medicine.

  Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.