If You Gain Weight Easily, Hyper-Efficient Gut Bacteria May Be To Blame

Scientists at the University of Copenhagen recently discovered that some microbes extract more energy from food than others. People who have these super-biomes then might have more food leftover to be stored as fat.

In other words, if you gain weight easily, your gut microbiome might just be really, really good at its job.

Researchers measured the leftover energy in study participants' excreted matter (ahem, their poop) to estimate how well their gut bacteria extracted energy from their meals, all while closely studying the types of microbes in each of their guts.

The scientists found that approximately 40% of the participants had gut microbial makeups that extracted energy more efficiently. That group of people also tended to weigh about 20 pounds more.

This finding suggests that the old "calories in, calories out" strategy for weight management may just be a crock of, erm...excreted matter. Your gut microbiome makes a difference too.

The study results also contribute to a growing body of evidence pointing toward bio-individuality, or the concept that our bodies are all uniquely complex, and what creates change for one person may have the opposite effect for another—or have no effect at all. (Just consider one 2016 study in Nutrition & Metabolism that found that mice that received a gut bacteria transplant2 from leaner mice lost weight.)

If you feel like you might fit into this category of people who store more fat than others on average, it may be frustrating if you've tried to manage or lose weight.

Exercise and diet play a huge role in your microbiome, and taking a daily probiotic supplement can help encourage a healthy balance of good bacteria in your gut, which has been connected to a healthy weight. Here are a few probiotic supplements that are teeming with beneficial bacteria.

A human study found that people whose microbiomes were, on average, more efficient at extracting energy from food, tended to weigh more by a significant margin. The researchers theorize that these hyper-efficient microbiomes can lead to an excess of stored fat and a greater risk of obesity.