The patients were monitored closely with the researchers studying their behavior including sleep, daily activity, emotions, and quality of life. The researchers concluded that the largest common factor between the fatigued brain injured individuals was their low vitamin D levels. Over 80% of the brain injured individuals that suffered from chronic fatigue had a vitamin D deficiency, in contrast to the 40% of brain injured individuals without chronic fatigue.

All patients who had been identified as having a vitamin D deficiency were given a supplement and reported they felt much better (less tired) after taking the vitamin.

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