Castor oil has, in fact, been used for thousands of years and was considered so valuable it was included in the tombs of ancient Pharos in Egypt as early as 4,000 B.C.

Glycemic index sounds highly unsexy, which is fair, but it's actually a diet hack that can help you to keep your blood sugars balanced with very little work. You don't even need to know the exact glycemic index of a particular food to understand how to use this system.