It looks like more and more evidence links obesity to type and quantity of bacteria in our gut. This is a case study of a woman who received a fecal transplant from her daughter to treat her diarrhea cause by an infection with Clostridium difficile. After about a year and a half post transplant the woman became obese and the weight gain could not be curbed by a change in diet and additional exercise.
http://www.upi.com/Health_News/2015/02/ ... 423067944/
http://ofid.oxfordjournals.org/content/2/1/ofv004.full
http://www.upi.com/Health_News/2015/02/ ... 423067944/
http://ofid.oxfordjournals.org/content/2/1/ofv004.full