Americans and Fiber Intake: A Growing Concern

It’s pretty obvious that many people in the U.S. struggle to get enough fiber.

According to the National Institutes of Health, around 95 percent of Americans fall short of the recommended daily intake of fiber, which is usually found in foods like berries, apples, broccoli, and lentils.

Fiber plays a vital role in keeping our digestion on track. It helps create bulk in stools, making them easier to pass, and it also slows down how quickly food leaves the stomach, which can make you feel fuller for longer.

If you don’t get at least 21 to 38 grams of fiber daily—depending on your age and sex—you might face issues like constipation, bloating, cramping, and gas. Over time, a low-fiber diet has been associated with chronic inflammation, diabetes, heart disease, and colon cancer.

However, experts are now warning about the potential risks of consuming too much fiber.

There’s a trend on social media called ‘fibermaxxing,’ where people are encouraging massive fiber intakes, particularly through various sodas and snacks rich in fiber.

Dietitians and doctors shared with DailyMail.com that while fiber is important, overdoing it can result in gastrointestinal distress. Symptoms might include constipation, bloating, gas, and abdominal pain.

Plus, long-term consumption of more than 50 grams daily could lead to rare intestinal blockages. Some studies indicate that certain fibers like inulin, often found in high-fiber beverages like Poppi, might even be linked to liver cancer.

Candace Pumper, a registered dietitian from The Ohio State University, emphasized the need for achieving the fiber recommendations for better overall health.

She noted that dietary fiber helps with more than just digestion—it can lower cholesterol, regulate blood sugar, and reduce inflammation, which collectively lowers the risk of conditions like heart disease and type 2 diabetes.

However, most Americans still don’t meet their daily fiber needs, making it crucial to address this issue.

To remedy this, snacks and beverages high in fiber have surged in popularity. Brands like Poppi and Olipop contain between three to nine grams of inulin, a naturally occurring fiber sourced from plants like chicory root and garlic. Inulin is considered a prebiotic that nourishes beneficial gut bacteria.

That said, there are growing concerns surrounding the long-term consumption of inulin. Andrew Gewirtz, a professor of biomedical science at Georgia State University, conducted a study indicating that mice fed inulin showed signs of liver issues and later developed liver cancer.

In another study from 2024, researchers suggested that inulin could be carcinogenic.

One alarming case study detailed a man who underwent a normal colonoscopy at age 56, only to find a malignant tumor seven years later. His only dietary change had been adding four grams of inulin powder daily.

Gena Hamshaw, a dietitian at Mount Sinai Hospital in New York, pointed out that while inulin may contribute to healthy gut flora, it doesn’t deliver all the benefits of other fiber types, specifically soluble fiber, which can help with cholesterol absorption.

She recommended a varied diet as the best way to maximize fiber benefits.

Consuming multiple fiber-rich sodas could quickly boost fiber intake, leading to issues if abrupt increases are made. Experts, including Brea Lofton from Lumen, reiterated the importance of cautious fiber additions to avoid gastrointestinal problems.

Pumper warned that a sudden increase in fiber could lead to bloating, gas, and digestive discomfort, and that a high fiber intake without proper hydration may cause complications.

In some extreme cases, excessive fiber intake has been linked to intestinal blockages, especially in those with pre-existing digestive conditions.

Hamshaw further explained that high fiber consumption could inhibit the absorption of essential minerals like iron and calcium. While a precise limit on fiber intake isn’t established, getting over 50 grams daily is generally considered risky. Some experts even suggest that the limit might be closer to 70 grams.

Overall, it’s essential to recognize that while fiber-rich foods—including fruits, vegetables, seeds, and grains—are highly nutritious, fiber-fortified snacks and drinks can fit into a healthy diet. Still, focusing on foods that offer a range of nutrients along with fiber might be the more beneficial choice.