Fibermaxxing: Why Boosting Fiber Intake Is Gaining Attention

Protein has dominated nutrition conversations in recent years, but another essential nutrient is now stepping into the spotlight: fiber. Despite its importance, fiber remains severely underconsumed. A report presented at the 2017 Food and Fiber Summit found that nearly 95% of adults and children in the United States do not meet recommended daily fiber intake levels.

Registered dietitian Eliza Whitaker, founder of Nourished Nutrition and Fitness, says the rise of “fibermaxxing” simply reflects a renewed focus on correcting this widespread deficiency. She notes that while the trend may be new on social media, the underlying goal—eating more fiber—has long been supported by nutrition science.

As interest grows, food brands and meal services are responding. Some meal delivery companies have begun offering fiber-forward plans, including Purple Carrot, which recently launched a high-fiber option alongside its vegan meal offerings.

What Is Fibermaxxing?

Fibermaxxing is a nutrition trend that encourages people to intentionally increase their daily fiber intake by prioritizing fiber-rich foods such as beans, fruits, nuts, seeds, and whole grains. Jessica McAllister, owner and lead dietitian at Dietitian Approved Nutrition, LLC, explains that the goal is to support digestive health, increase feelings of fullness, and assist with weight management.

Current guidelines recommend that adults consume between 25 and 38 grams of fiber per day, depending on age and sex. However, most Americans fall well below that range. Low fiber intake has been linked to several health concerns, including rising rates of colorectal cancer among younger adults. According to cancer research organizations, colorectal cancer is now one of the leading causes of cancer-related deaths, with inadequate fiber intake identified as a contributing risk factor.

Is Fibermaxxing Safe for Everyone?

For most healthy individuals, gradually increasing fiber intake to meet daily recommendations is considered safe and beneficial. Dietitian Maya Feller, founder of Maya Feller Nutrition, advises easing into higher fiber consumption rather than making abrupt changes.

Consuming too much fiber too quickly can cause bloating, gas, cramping, and digestive discomfort. People with certain gastrointestinal conditions—including irritable bowel syndrome, Crohn’s disease, diverticulitis, inflammatory bowel disease, gastroparesis, or small intestinal bacterial overgrowth—should be especially cautious. In these cases, consulting a healthcare provider before significantly increasing fiber intake is recommended.

McAllister stresses the importance of hydration when increasing fiber, as water helps fiber move smoothly through the digestive system. She also cautions against relying heavily on supplements, encouraging whole food sources instead.

Whitaker adds that individuals with a history of eating disorders should avoid tracking fiber intake too closely, as it may contribute to restrictive or compulsive behaviors.

Can Fiber Support Weight Loss?

Fiber can help promote satiety, which may reduce overall calorie intake and support weight management. However, McAllister notes that fiber alone does not guarantee weight loss. Achieving weight loss still requires an overall calorie deficit and balanced eating habits.

Feller warns against excessive fiber intake as a weight-loss strategy, explaining that overconsumption can lead to digestive distress, nutrient malabsorption, and, in extreme cases, malnutrition.

Benefits of a Fiber-Rich Diet

Experts agree that adequate fiber intake offers a wide range of health benefits, including:

• Lowering LDL (“bad”) cholesterol by helping remove it through digestion
• Supporting stable blood sugar levels
• Acting as a prebiotic that feeds beneficial gut bacteria
• Reducing inflammation and the risk of chronic disease
• Promoting regular bowel movements
• Lowering the risk of conditions such as colorectal cancer, Type 2 diabetes, and heart disease

Understanding the Two Types of Fiber

Fiber is a carbohydrate that the body does not digest, allowing it to play a critical role in gut health. There are two primary types:

• Soluble fiber, which dissolves in water and forms a gel-like substance that helps regulate blood sugar and cholesterol. Common sources include oats, apples, carrots, peas, and beans.
• Insoluble fiber, which adds bulk to stool and supports regular digestion. This type is found in foods like whole grains, celery, cabbage, and apple skins.

Daily Fiber Recommendations

According to the USDA’s 2020–2025 Dietary Guidelines:

• Women ages 19–30: 28 grams per day
• Women ages 31–50: 25 grams
• Women 51 and older: 22 grams
• Men ages 19–30: 34 grams
• Men ages 31–50: 31 grams
• Men 51 and older: 28 grams

For reference, half a cup of cooked lentils contains about 8 grams of fiber, a medium apple provides nearly 5 grams, and half a cup of whole-grain cereal delivers around 7.5 grams.

Some individuals—such as those with chronic constipation, high cholesterol, Type 2 diabetes, or those who are pregnant or breastfeeding—may require higher fiber intake. However, exceeding recommended amounts can lead to diarrhea and impaired nutrient absorption.

Best Whole-Food Sources of Fiber

To increase fiber intake naturally, Whitaker recommends incorporating a variety of whole foods, including:

• Chia and flaxseeds
• Oats
• Chickpeas and lentils
• Quinoa and brown rice
• Beans and nuts
• Fruits and vegetables such as prunes, cabbage, and broccoli
• Fonio and other whole grains

Adding these foods can contribute an additional 5 to 15 grams of fiber per meal, helping most people reach their daily targets.

At its core, fibermaxxing is less about following a trend and more about meeting long-standing nutritional recommendations. By thoughtfully incorporating more fiber-rich foods into daily meals, individuals can support digestion, heart health, and overall well-being in a sustainable way.