Links
[1] https://hootsgo.org/?q=node/6373
[2] http://en.wikipedia.org/wiki/Human_nutrition
[3] http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/N/Nutrition.html
[4] http://www.britannica.com/EBchecked/topic/422896/human-nutrition
[5] http://ib.berkeley.edu/courses/bio11/SimisonApril19.pdf
[6] http://jn.nutrition.org/content/126/6/1732.full.pdf