Editor's Note: Gallup re-estimated its Gallup-Healthways Well-Being Index and Life Evaluation Index data from January 2008 to April 2009 to address context effects that Gallup discovered after the data were originally published.
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The Gallup-Sharecare Well-Being Index tracks daily the percentage of Americans who, reflecting on the day before they were surveyed, say they experienced a lot of happiness and enjoyment without a lot of stress and worry versus the percentage who say they experienced daily worry and stress without a lot of happiness and enjoyment. Daily results are based on telephone interviews with approximately 500 national adults; margin of error is ±5 percentage points.
In the Gallup-Sharecare health measure, ailing Americans are those who, reflecting on the day before they were surveyed, say they experienced physical pain, a headache, a cold, or the flu. Energized Americans are those who, reflecting on the day before they were surveyed, say they were well-rested, had energy, and experienced none of the above ailments. Results are based on telephone interviews with approximately 500 national adults; margin of error is ±5 percentage points.
Americans’ collective level of happiness or enjoyment without a lot of stress or worry fell to a new low of 35% on Thursday, Dec. 11, the same day the U.S. Labor Department announced a 26-year high in new jobless claims and the auto bailout bill failed in the Senate.

The latest World Happiness Report explores the impact of acts of generosity on happiness -- just as these deeds appear to be declining worldwide.
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