Since 1938, the Harvard Study of Adult Development has been following the lives of more than 2,000 people over three generations.

What have they learned about the factors that predict happiness?

Two of the current directors of the project, Robert J. Waldinger, MD, and Marc Schulz, PhD, wrote a book that summarizes the study’s findings. According to the book, The Good Life: Lessons From the World’s Longest Scientific Study of Happiness, there are two consistent contributors to happiness:

• Take care of your health
• Build your friendships and family relationships

Isn’t it nice when a guide to life is presented so simply and directly?

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Deepen your body of knowledge

Keys to chronic happiness from Kaiser Health News