If you truly must read literature on Christmas, then I direct you to thebmj, and a selection of articles from its Christmas issue:
“Televised medical talk shows—what they recommend and the evidence to support their recommendations: a prospective observational study”
http://www.bmj.com/content/349/bmj.g7346
“CARTOONS KILL: casualties in animated recreational theater in an objective observational new study of kids’ introduction to loss of life”
http://www.bmj.com/content/349/bmj.g7184
“When somebody loses weight, where does the fat go?”
http://www.bmj.com/content/349/bmj.g7257
“Are some diets “mass murder”?”
http://www.bmj.com/content/349/bmj.g7654