The study appears to be true.
http://www.nature.com/ismej/journal/vaop/ncurrent/full/ismej2012153a.html
But it should be noted that the endotoxin-producing Gram-negative bacterium are only one potential causative factor in human obesity. It's not as if, "I'm fat because I have gut microbiota that makes me this way." In the clinical trials, it was changing the test subject's diet that yielded the best results. By the end of 23 weeks, the presence of /Enterobacter/ was too insignificant to detect and the subject had lost just over 110 lbs throughout the course of the trial.
By the way, Einstein. Your diet is the most likely culprit for your weight issues. I would suggest sitting down with a nutritionist if you want to get serious about your health. I sit for extremely long periods in my job as well, but I'm still in as good of shape now at 35 as I was just 10 years ago in my mid-20's. I don't drink nearly as much caffeine as I did then, I cut down my portions significantly relative to my metabolism, began eating at home more (staying away from fast food, TV dinners, etc), and maintain a regular calisthenic routine. I've also quit smoking within the past few years, and drink far less which seems to have helped significantly. In many ways, I feel /better/ now than I did in my 20's.
Caffeine, sodium, acidic drinks (such as orange juice), dairy, starchy, high carb, and protein-rich diets are absolutely horrible for anyone with weight gain issues. As much as I love my meat, vegan dishes are probably much healthier for you than a Subway sandwich. If you need to shed a significant number of pounds fast, you might want to look into liquid diets (or "jucing"), they're rather popular with Hollywood stars.
My wife is a little more obsessed with the health craze than I am, and a little more extreme when it comes to what humans ought to be eating. I usually defer these kinds of conversations to her. I don't tangle with a woman -- especially the mother of my child -- who knows far more about paleoanthropology than I do, and could fit into her High School prom dress within just 3 1/2 weeks postpartum.
Caution Wake Turbulence