Magnesium is vital ingredient that most of us lack due to taking in too much caffeine, sugar, alcohol, and smoking. It is needed for cell transport activity and an import part in keeping bones and the heart strong. Magnesium is imperative to brain health and is considered the chill pill for the system. You can this mineral in beans, greens, bananas, and organ meats. Get enough iron, as this also leads to depression, brain fog, fatigue and anemia. Health.com reported that the lacks of iron causes less oxygen to reach the body, and it levels are too low cause a heart attack “If your "normal" fatigue is coupled with you feeling, weak, irritable, or unable to focus, iron (or a lack thereof) might have something to do with it.” Oysters, fish, sweet potatoes, nuts and seeds all have iron.