We get our fiber from plant based foods. Plants use fiber to support their structures whereas animals use muscles and bones.
Fiber helps with sugar or glucose levels in blood, cholesterol, and constipation. It can be found in various grains, legumes, fruits, vegetables, seeds, nuts, and oils. If the food is highly processed the fiber contents will be affected.
If you’re increasing your fiber intake please start gradually because your body needs time to adjust. If you increase your intake of water it can help in this transition.