Feeling like you’re running on empty? Try upping your iron intake. Iron’s a crucial mineral that binds oxygen in red blood cells, but we’re not getting enough of it, which can lead to impaired cognitive function, fatigue, and inability to regulate body temp. How can you get your daily dose? Liver contains the most iron per serving, but if you’d rather steer clear of eating organs, opt for white beans. The strong runner-up is rich in copper, folate, and potassium, too.