Final answer:
Good sources of insoluble fiber are whole wheat, beans, potatoes, root vegetables, and seeds and nuts. To increase fiber intake, substitute refined grains with whole grains, consume more legumes, and have at least five servings of fruits and vegetables per day. These recommendations are specifically for North Americans.
Step-by-step explanation:
Insoluble fiber can be found in various foods. Good sources of insoluble fiber include whole wheat, wheat bran, beans, potatoes, root vegetables such as sweet potatoes and onions, and seeds and nuts like psyllium seed husks and flax seeds.
Increase your fiber intake by substituting refined grains with whole grains, consuming more legumes such as beans, and trying to have at least five servings of fruits and vegetables each day.
These recommendations are suitable for North Americans who want to increase their fiber intake.