Stanford professor, Justin Sonnenberg, seems to think that obesity has something to do with the 100 trillion microbes living in our bodies.

Why?

Well, gut microbes influence fat storage, insulin secretion and manage the hormones that make us feel hungry or full. Scientists found that thin and obese people have different microbes and that “obese” microbes can lead to weight gain (in mice, at least).

Researchers also found that thin people had more diverse bacteria in their gut when compared to obese people and a diet full of highly processed (low fiber) food seemed to promote a less diverse microbiome.

Read: Here’s why Cold FX will make you poor and sick

Doomed from the start:

Babies born via cesarean section or fed formula instead of breast milk are more likely to be obese (among other susceptibilities like allergies, asthma, eczema and celiac disease). This is thought to be because they aren’t exposed to the bacteria thriving in their mother’s vaginal cavity, including the ones needed to digest milk.

Read: Mom not only gave you life, she gave you bacteria

What can be done?

Fecal transplants have been proposed as a possible treatment to regulate and “correct” the microbiome of obese people. Although there are risks associated, poop transplants are used as an effective treatment against Clostridium difficile infections.

Read: How someone else’s poop can save your life

For more:

How someone else’s poop can save your life

How gut bacteria help make us fat or thin

VIDEO: Is it all in your gut?

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