Both soluble fiber and insoluble fiber can be found in plant foods. The difference lies in whether or not the food can be dissolved in water. Soluble fiber foods are foods that can be dissolved in water and actually provide the greatest health benefits. Soluble fibers typically would include the pulps or insides of fruits and vegetables, usually soft in nature. Soluble fibers undergo fermentation which will produce health benefits that we will discuss later. Insoluble fibers cannot be dissolved in water but aid in digestion and movement of stool within our bodies. Insoluble fibers are usually more sturdy in nature when compared to soluble fibers. Examples may include fruit or vegetable skins, stems, roots, seeds, etc.