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Want your brain to be as sharp as someone’s a decade younger? Eat more spinach and kale. A 10-year study of more than 950 older adults found that those who ate just one or two servings of leafy greens per day had the cognitive abilities of people 11 years younger. Why it works: The lutein and vitamin K in the greens protect cognitive function. Important: If you take the blood thinner warfarin, work with your doctor to modify your dosage if you increase your intake of leafy greens.

Martha Clare Morris, ScD, director of nutrition and nutritional epidemiology, Rush University, Chicago.