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Fiber Math on the Fly

Fiber Math on the FlyThere’s no shortage of interest in dietary fiber. We know fiber is good for us, but we also know that most Americans are not getting enough fiber.

While the Institute of Medicine Dietary Reference Intakes and the Dietary Guidelines for Americans, 2010 recommend between 25-38 grams of fiber per day (for adult females and males, respectively), it is estimated that Americans, on average, eat only 15 grams of fiber per day.

As a nation, we are eating only about half of our daily fiber needs.

While there are some fancy electronic fiber calculators and screeners out there (see recent posts on fiber counter tools here, here and here), sometimes you have to rely on good old fashioned math.

Here is a quick and dirty estimation method for determining average daily fiber intake. To use this, you will need a one-day (24-hour) food record.

To estimate average daily fiber intake from a food record:

  • Multiply the number of fruit and vegetable servings by 1.5 grams (a fruit/vegetable serving is 1 cup raw or 1/2 cup cooked)
  • Multiply the number of whole grain servings by 2.5 grams (a whole grain serving is roughly 1 oz or 1/2 cup cooked grain)
  • Multiply the number of refined grain servings by 1.0 grams (a refined grain serving size is the same as a whole grain)
  • Add specific fiber amount for nuts, legumes, seeds, and high-fiber cereals
  • Total to estimate fiber intake per day

This fiber estimation method is a tool developed and published by researchers at the University of Wisconsin, Madison. It is especially helpful for healthcare practitioners looking to estimate fiber intake as part of the nutrition screening process.

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