23 Jul 2018 --- The increasingly popular fiber-rich “New Nordic Diet” might not work for everyone as its success depends on the particular combination of bacteria in the intestines of the dieter, according to a study in the International Journal of Obesity. In the era of personalized nutrition, the involved researchers note that there might be value in getting your stool tested and your gut bacteria counted before starting on a new diet. The results can be used to predict whether a particular diet will work for you.