Fitzilla

So now there finding a link with the type of bacteria in your gut and obesity. Makes sense since these bacteria evolved with us. Those people with the obese bacteria would be more efficient at extracting calories during famine.

http://www.guardian.co.uk/medicine/story/0,,1976637,00.html

"They transferred samples of the gut bacteria from obese and lean mice into two groups of microbiota-free mice. The mice given the "obese" bacteria extracted more calories from their food than those given the "lean" bacteria. They also found that the bacteria in obese mice was rich in genes for enzymes that broke down otherwise indigestible sugars. "The bacteria in obese mice seemed to assist their host in extracting extra calories from ingested food that could then be used as energy," Prof Seeley said."