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Eating more fruits and veggies boosts happiness, according to a study at the University of Warwick in England. By following more than 12,000 people, researchers found that happiness increases with each extra portion of such foods, leveling out at 8 servings a day. After consistently eating that amount for 24 months, the researchers estimate, the boost in life satisfaction could equal that of getting a job after a period of unemployment. The study was published in the American Journal of Public Health.