Sex hormones influence your energy, sleep, motivation and drive. Estrogen, testosterone, and progesterone are all big factors in how you feel on a daily basis.

Methylation is a very small, foundational chemical function in your body. It involves the moving of a methyl group, which is a carbon with three hydrogens that you can picture a lot like a Mickey Mouse head with an extra ear (shudder).

Understanding fatigue means understanding what gives you the feeling of having energy in the first place.