Obesity and thinness: insights from genetics.

Abstract excerpt

Genetic disruption of key molecular components of the hypothalamic leptin-melanocortin pathway causes severe obesity in mice and humans. Physiological studies in people who carry these mutations have shown that the adipose tissue-derived hormone leptin primarily acts to defend against starvation. A lack of leptin causes an intense drive to eat and increases the rewarding properties of food, demonstrating that...

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