Most Americans are not getting enough fiber in our diets

Most Americans are not getting enough fiber in our diets
Average daily fiber intake (in grams of fiber per 1,000 calories consumed) among U.S. adults by gender and diabetes status. Credit: Derek Miketinas, Texas Woman's University

Only 5% of men and 9% of women are getting the recommended daily amount of dietary fiber, according to a study being presented at NUTRITION 2021 LIVE ONLINE. Insufficient fiber intake is associated with a higher risk of heart disease and diabetes, two of the most common diseases in the U.S.

"These findings should remind people to choose fiber-rich foods like whole grains, fruits and vegetables to reduce their risk for heart disease," said Derek Miketinas, Ph.D., RD, an assistant professor at Texas Woman's University, the study's lead author. "Based on our findings, fewer than 1 in 10 U.S. adults meet their daily recommendations for fiber intake. For those with diabetes, it is especially important to eat enough fiber since they are at a greater risk for heart disease."

Fiber is a type of carbohydrate that passes through the body undigested. Though perhaps best known for its role in supporting regular bowel movements, fiber also carries important benefits for cardiovascular health. Studies suggest dietary fiber can help lower cholesterol, and inflammation and help prevent diabetes. It can also improve blood sugar levels for people with diabetes.

The researchers analyzed data from more than 14,600 U.S. adults who participated in the National Health and Nutrition Examination Survey (NHANES) between 2013-2018. Fiber intake was assessed using dietary questionnaires; diabetes status was self-reported and also assessed with hemoglobin A1c (HbA1c) levels. Researchers only analyzed fiber intake from dietary sources, excluding fiber supplements.

"Unlike other similar studies, our analysis estimated Americans' usual fiber intake using advanced statistical methods instead of calculating a simple average," said Miketinas. "This approach is a better indicator of what a person typically eats because it can account for other factors that may influence fiber intake."

Health guidelines recommend eating 14 grams of fiber for every 1,000 calories consumed (g/1,000 kcal) daily. On average, women in the study consumed 9.9 g/1,000 kcal and men consumed 8.7 g/1,000 kcal. Among those with diabetes, women consumed 10.3 g/1,000 kcal and men consumed 9.6 g/1,000 kcal, higher than average but still falling short of recommendations.

To get the right amount of fiber, the typical woman should aim for about 25 grams (for a 2,000 calorie diet), while men should aim for 38 grams (for a 2,500 calorie diet), with lower targets for those over age 50. This typically requires a good mix of fruits, vegetables and . For perspective, choosing a whole grain such as pearled barley will provide 6 grams of fiber per cup compared to less than 2 grams of fiber in white rice.

In addition to shedding light on Americans' eating habits, Miketinas said the new findings can help inform future research into chronic disease prevention.

"The results of this study can be used to identify relationships between dietary and outcomes of interest like risk factors for heart disease," said Miketinas. "In fact, our preliminary analysis suggests that higher intake in adults with is strongly associated with reductions in markers for heart and kidney ."


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