THE HAPPINESS DIET: A Nutritional Prescription for a Sharp Brain, Balanced Mood, and Lean, Energized Body, by Tyler Graham & Drew Ramsey, MD. Rodale Books, 288 pp., $25.99.

Graham, a health journalist, and Ramsey, an assistant clinical professor of psychiatry at Columbia University, say what you eat definitely affects how happy you are. Emerging neuroscience and nutrition research, they write, shows "that by changing what you eat, you can improve your mental and emotional well-being. . . . You can even make your brain grow."

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First, flee from the Modern American Diet -- "we call it MAD" -- of simple sugars and refined carbs, which leads to "Unhappy Meals" that "can expand your waistline and starve your brain at the same time."

THE SCOOP They tout the top 5 mood foods: Wild salmon/ shrimp, cherry tomatoes/watermelon, chili peppers, beets and garlic. (Hold the white pasta.)

THE BOTTOM LINE Enjoy cheeseburgers like that gorgeous one on the cover -- if the beef and cheese come from grass-fed cows, the veggies are organic and the bun is whole-grain.