When it comes to dietary fiber in food, people often think of celery. Besides celery, which foods are high in dietary fiber...
The first category is dietary fiber—the highest content is found in seaweed, which is a type of water-soluble dietary fiber. It has a relatively high content of water-soluble fiber.
The second category is whole grains and whole wheat—this includes oats and some legumes. This is because whole grain foods have a high content of water-soluble dietary fiber, which is mostly found in the bran.
The third category is mushrooms—after being soaked in water, mushrooms can sometimes feel a bit slimy to the touch. For example, the slimy feel of shiitake mushrooms after soaking indicates a high dietary fiber content.
The fourth category is root and stem vegetables—that is, the roots or stems of vegetables.
The fifth category is fruits and vegetables—this refers to leafy green vegetables and fruits.