Liver
We all know that humans and their ancestors ate the animals for millions of years. Now, the modern Western diet has prioritized muscle meat over organ meats. It is fascinating to know that liver is a remarkable organ with hundreds of functions related to metabolism. However, one of its functions is to store all the essential nutrients for the rest of your body.
The liver contains Vitamin B12, vitamin B5, vitamin B6, vitamin B2, vitamin A, niacin, folate, copper, zinc, and selenium. Moreover, live is also a high-quality animal protein. Eating liver once a week is known as the best way to ensure that you get optimal amounts of these vital nutrients.