I was meaning the bacteria won't eat sugars or carbs nearly as much. Especially artificial sugar, which relates to us as adding pounds. Sugar, in it's purer forms is a known preservative. So it makes sense bacteria don't exactly love it, though I'm guessing the stomach isn't highly saturated so it might add for more bacteria food. I wasn't really thinking earlier, still am not full speed as I'm now really tired. Either way, malnutrition causes the body to put on weight. So it isn't hard to believe that fast growing bacteria could be very bad for the digestion system. That was my main point, I'm sticking with that.
 Didn't read the other posts but there is a lot of bad information and I'm going to try and rectify that. I'm not going to get into the bacteria side, as that's not one of my more known subjects. Can't believe I didn't think of sugars in low saturation being a huge food source. Man, I learned that early with cultivation of bacteria. I was actually thinking of using certain sugars to harvest bacteria that was high in nitrates, for other food (plant ect...) but never got around to that. Anywho, I digress...
To those thinking on how you guess your calorie intake, it isn't hard AT ALL. On average, without exercise the average male consumes about 2500 calories a day. We have charts, even full blown books, dedicated to figuring out how many calories you burn doing specific activities. Walking, standing, running, are all known within margin of error for certain body sizes and body fat contents.
Take me, 6" and 155lbs. I can figure out my body fat (roughly) through certain body measurements. I can then take that body fat percent, use it to figure out my obvious muscle density. With that, we can then use those said charts/books and figure out how many calories I would burn doing a 1 mile walk. I could figure out what I burn standing all day at work. What I burn sitting around at home, even what I burn sleeping.
No, it's not hard at all. Tip o' the day: The average male burns ~1000 calories sleeping.
Also, weight gain is not genetic unless you have a stomach condition or a few (FEW!) medical conditions that affect metabolism. Most of those aren't even directly from the medical condition but rather the side effects of the treatments. I would say it's a high chance that your obesity, if you are so, is due to your own habits. The stomach itself breaks down nutrients the same way from body to body. The only major factor playing there would be nutrient abortion from one stomach to the other. However that is going to be minimal, as most absorption is done automatically due to some biological "rules". I won't get into that, don't care.
People who exercise a lot don't exactly eat a lot. it depends on what you do, what part of the body you are working on. A body builder is going to take in less carbs than a swimmer or runner, they are working more on bulk. However you will want more protein intake if you want to do that, to keep muscle mass up as well as continue to build more.
This isn't old news, it isn't new news. It is the same concept as before the article. This article just shows insight to those people who eat the same and burn the same as another person but gets less results. They may have to burn more, while eating the same, to get similar results. Either way the method for burning fat effectively remains the same. Plan out your carb/calorie/protein/ect... intake as well as what you burn. Eat healthy and exercise. This just means those people who have a harder time might get it easier.Edited by mushroomboy - 12/24/12 at 7:43pm