Walnuts are an excellent source of calcium! Just kidding  :) Actually 5 walnuts have only 2% of your daily calcium so you'd need to eat 250 to get your daily calcium requirement! Of course, 5 walnuts also have 2 grams of fiber so you'd also get 4 days worth of fiber, not to mention 10,000 calories!

It is said that walnuts are a heart healthy food, but only if you eat them instead of something else rather than in addition to it!