Washington: Geneticist Steve Horvath led a team of 65 scientists in seven countries to record age-related changes to human DNA, calculate biological age and estimate a person’s lifespan. A higher biological age—regardless of chronological age—consistently predicted an earlier death.

  Athens: Dental surface restorations composed of dental amalgam, a mixture of mercury, silver, tin and other metals, significantly contribute to prolonged mercury levels in the body, according to new research from the University of Georgia’s department of environmental health science in the College of Public Health.

Washington: Having a happy spouse may be related to better health, at least among middle-aged and older adults.

Vienna: An international study has found that having a high status job means that you are less likely to respond to standard treatment with medications for depression. These results, which may have implications for clinicians and their patients, employers and public policy, are presented at the ECNP Congress here.

San Diego: Loneliness is linked to poor physical and mental health, and is an even more accurate predictor of early death than obesity. To better understand who is at risk, researchers at University of California San Diego School of Medicine conducted the first genome-wide association study for loneliness — as a life-long trait, not a temporary state. They discovered that risk for feeling lonely is partially due to genetics, but environment plays a bigger role. 

Washington: A late night at the library, copious amounts of energy drinks or coffee and class notes from the last month; surely you’ll be able to ace the exam if you just spend the next 24 hours focused on the material. Unfortunately, procrastination and sleep deprivation do much more harm than good. A Texas A&M College of Medicine sleep expert explains exactly how much that all-nighter is hurting you—and your performance.