Just because we eat plants doesn’t mean that we can actually use every single ounce of them. Fiber is the indigestible part of plants, and it’s very beneficial. There are two types: soluble and insoluble. Soluble fiber absorbs fluid, turning gelatinous when consumed. Insoluble fiber adds bulk, which softens stool and speeds foods through your system. Both improve the body’s ability to digest and process foods, as well as reduce cholesterol and aid fat loss.