There is an interesting article at nature.com
"Scientists have identified a key microbe in our guts that helps us glean more calories from food. The discovery backs the idea that the type of microbes in our gut help to determine how much weight we gain, and that seeding the intestine with particular bugs could help fight obesity."
What I found just as interesting were some of the comments:
"Obesity is a problem of global importance, indeed, yet famine continues to be a significant human condition as well. M. smithii could then perhaps have a therapeutic role for the calorically-challenged at both ends of the spectrum: lack, as well as excess."
"Very interesting research with implications not just in obesity, but also for efficiency of feed disgestion in farmed animals. It would have been good to include the results obtained with the same diet fed to mice with a normal gut microflora."
"Research like this holds great promise that we will someday better understand the complex ecology of our internal microflora and be able to apply that knowledge to aid the health of those from both ends of the weight control spectrum."
"When I read this article, the effect of M.smithii on obesity did not register very much on my mind. By far the more important function of this organism is to my mind, its ability to render the gut environment conducive to the growth of normal flora which, by occupying that environment inhibit the growth of pathogenic transient flora. By understanding the activity of this organism we bring forward the time when 'friendly' organisms rather than the more 'violent' antibiotics can be prescribed for the treatment of GIT infections."
On a lighter side:
Too many people confine their exercise to jumping to conclusions, running up bills, stretching the truth, bending over backward, lying down on the job, sidestepping responsibility and pushing their luck. Author unknown.