A diet with a high diversity of food components including, fruits, vegetables, olive oil, nuts, legumes and whole grains. Plant foods containing fiber are the best fuel for your gut bacteria. That is why a plant-based diet that includes a variety of whole grains, legumes, vegetables, and fruit is beneficial for your gut health—and, as a result, for your overall health and wellness—since it increases the diversity of your gut microbiota. In other words, the more diverse the gut microbiota, the more resilient it will be.