Oranges and Grapefruit

Even a small deficiency in vitamin C – a key ingredient for boosting levels of nor-epinephrine – can leave you feeling irritable and blue. A lack of vitamin-C-rich foods also inhibits your body’s ability to absorb the iron it needs to fight fatigue. Eating roughly 6 oranges per day can result in less nervousness, crankiness and depression. Vitamin C supplements are also effective.