Im a bit concerned about one of my friends children. They are 5 and have had dark circles around their eyes the last few times i have seen them and im wondering if it could be a sign of a deficiency? I know the child is not a fantastic eater, and gets fed alot of junk (crisps, biscuits etc, convenience foods, and not alot of f&v, fresh and good quality meat products etc). They also sleep alot and have to be woken by my friend every morning. Might just be good sleeper but also maybe a sign of a deficiency? Definitely shouldn't be tired anyway so dark circles aren't because of lack of sleep.