Gut bacteria can reveal if you can lose weight.  According to a study at the University of Copenhagen, Denmark, gut bacteria can play a major role in our ability to lose weight. While gut bacteria has long played a role in obesity, it’s possible that it can also help scientists figure out how to treat overweight patients as well. In the study, half of the participants ate according to the Danish national dietary recommendations, consuming lots of fresh produce, whole grains, and fiber. The other group followed the New Nordic Diet, which resembles the Mediterranean diet in many ways. Those on the new diet lost 3.5 kg while those on the average Danish diet lose 1.7 kg. It appears that high levels of Prevotella bacteria lead to greater weight loss; the participants with a higher amount of Prevotella bacteria lost more weight on the New Nordic Diet than those who had less. These results demonstrate that it’s not just the diet type, but other factors as well, that can contribute to weight loss, further banishing the “one size fits all” concept.