Gut microbiome differences are linked to differences in body weight, but remember: which bacteria grow is largely determined by which foods we eat.
You may have heard of a study described something like this: Gut bacteria from obese mice were transferred to lean mice, and the lean mice started to gain weight. Several studies have found variability in the microbiomes between lean and obese people. It may sound like a change to the bacterial species populating the gut could be a magic pill that sparks weight loss, but it’s not so magical; for each of us, the profile of the gut microbiome is primarily a result of what we eat.
Read More at DrFuhrman.com: Do lean and obese people have different gut bacteria?