The balance of bacteria that take up residence in the digestive system of an obese person compared to someone of average weight is significantly different. They have a different ratio of bacteria, and this imbalance can have an profound effect on the person. As the person loses weight, their bacteria profile changes to that of an average weight person. Questions that needs further study are whether adding specific probiotics to the diet of a person battling obesity can aid in weight loss and whether the overuse of antibiotics might be a contributing factor to the obesity epidemic.
Gut health can influence your appetite and in turn your weight. A bacterium called H. pylori plays an important role in regulating stomach acids and it also regulates a peptin called gastric ghrelin. Ghrelin is elevated when you need to eat and goes down when you are full. If you don’t have H. pylori to regulate gastric ghrelin (levels of which influence your appetite) you may have high levels of ghrelin making you feel hungry all the time . I just used a lot of big words. Basically, if you don’t have the right bacteria in your stomach you can actually feel hungry when you don’t need more food. Wow!
Bacteria can also effect gut health in how the bacteria digest the available food.
“Another mechanism by which the gut microbiota affects body weight is by increasing energy harvesting from dietary fibers. The intestinal microbiota breaks down indigestible polysaccharides (i.e., fiber) to short-chain fatty acids (SCFAs) providing 80 to 200kcal per day or about 4–10% of daily energy intake in normal adults… An estimate of 150kcal difference can be achieved with a change of 20% relative abundance of Firmicutes and corresponding decrease of Bacteroidetes in the stool of lean individuals. Thus, excessive calories taken in the form of SCFAs from microbiota metabolism of fiber may be a contributing factor in the obese state. ”
My paraphrase: So eating the same type and amount of food, obese people would get more calories out of it. The flora found in human guts actually breaks down indigestible fiber into digestible short chain fatty acids, turning previously inaccessible energy in food into fuel. Obese people have more of the bacteria that do this conversion so they are able to harvest more energy (ie. get more calories) from food.
Digestive tracks are full of a myriad of different microorganisms and altering the balance of these microbes can effects many areas of our health including obesity and weight gain. The two aspects I’ve talked about are just a couple ways gut flora can effect weight. Like all things dealing with the gut, the relationship between bacteria balance/imbalance and your health is very complex. Just the combination of these 2 ideas is a recipe for disaster. An increase in appetite coupled with getting more calories out of that food can make it difficult to maintain or lose weight.
So now that you know this, what can you do? Adding probiotic to your diet either in pill form or in foods like all the yummy lactofermented foods you’ll find in my Recipe section as well as yogurt, kefir, kombucha is one of the best things you can do for your health. It’s not proven yet whether adding probiotics will aid in weight loss but it sure doesn’t hurt to try. ETA: I should note, ferments do not contain H. pylori (none that I am aware of at least). It’s mutual beneficial relationship with us just shows how complex this relationship is and may make us think twice about wiping them out with antibiotics.
 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3270440/ “Is the Gut Microbiota a New Factor Contributing to Obesity and Its Metabolic Disorders?”
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