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Leptin is a hormone made by fat cells that tells you when you're full. If you didn't have leptin---and some people don't---youd eat way too much, get real fat and almost certainly develop diabetes. Leptin acts like a natural appetite suppressant. Kid

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Sepsis is a severe infection that can often be fatal, particularly in obese patients. Now, a new study suggests why obese patients are at greater risk and suggests a possible new approach to treatment. Sepsis is seven times more likely to kill patien

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Ketamine is a horse tranquilizer but also a popular but illegal recreational drug on the club scene. Now researchers in the English National Health Service say it could be a dramatic new treatment for depression. They've conducted a small trial. A mo

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However, the observation that morphine can decrease social behaviors as well prompted scientists to investigate the connection between the opioid system and social relationships. They compared normal baby mice to baby mice lacking a crucial opioid re