To determine what happens when you pass on a glass of milk, Marketplace spent months analyzing nutrition studies, interviewed doctors and dietitians, and reviewed one family's weeklong food diaries.

It's regularly touted as a "superfood" or a "healthy fat" and is found in health food stores across the country. But coconut oil is made up almost entirely of saturated fat. Marketplace looks at how the product came to be seen as an attractive alternative for cooking, baking — and even in coffee.