Fiber is interesting in the sense that it’s not a nutrient. In fact, by definition fiber can’t be digested.
This is not usually how we think of nutrition. Usually we look at food as fuel for the body (most of it is), but surprisingly the part that our body just disposes of is an essential component of the total package.
Fiber helps stabilize blood sugar levels, and having stable blood sugar levels is important for your long-term hormonal and metabolic health.
Oh, and it keeps you regular.
I like getting fiber from beans, vegetables, and fruit (one of the reasons why whole fruit is so much better than fruit juice is because fruit juice has been stripped of its fiber).
Wherever you choose to look for your fiber, narrow your search to whole foods instead of something in a box that claims that fiber was added.