Love sweet red, green, and yellow bell peppers? Know which are most healthful?

The red and yellow ones -- they have almost twice as much vitamin C as their green siblings. And getting an ample supply of C is credited with reducing the risk of stroke, one of the most common causes of death and disability in Americans.

Researchers have found that people with the lowest amounts of vitamin C in their diets have a 30 percent greater risk of having a stroke compared to those with the largest intake of C. So when you're grocery shopping, pick up a few extra bell peppers. Midsummer is prime season for them -- they're sweet, cheap, and abundant. Still, you can eat only so many peppers. For variety, reach for other high-C foods: papaya, strawberries, cantaloupe, citrus fruit, and broccoli are all-stars when it comes to this potent vitamin.