Fiber: The Unsung Hero of a Healthy Diet

Fiber can offer unique health benefits, from supporting digestion to lowering blood sugar levels.

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Science-based and reviewed

May 20, 2024
May 7, 2024
— Updated:
May 7, 2024

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Fiber is a crucial component of a healthy diet, yet it's often overlooked. Fiber is found in plant-based foods and provides a range of health benefits, from supporting digestion to reducing the risk of chronic diseases. Understanding the importance of fiber and incorporating it into your diet can significantly impact your overall health and well-being.


Types of Fiber

Fiber comes in two main types: soluble and insoluble. Each offers unique health benefits. Including a variety of foods rich in both types of fiber in your diet can help you maintain good digestive health and overall well-being.

Soluble Fiber

Soluble fiber dissolves in water to form a gel-like substance in your gut. It can help lower cholesterol levels and regulate blood sugar levels. Foods rich in soluble fiber include oats, barley, legumes, fruits like apples, oranges, and berries, and vegetables such as carrots and Brussels sprouts.

Insoluble Fiber

On the other hand, insoluble fiber does not dissolve in water and passes through your digestive system largely intact. It adds bulk to your stool, preventing constipation and promoting a healthy digestive system. Foods rich in insoluble fiber include whole grains like wheat bran, whole wheat bread, brown rice, nuts, seeds, and the skins of fruits and vegetables.

However, don't stress about which foods have which type of fiber. Just focus on eating various plant foods like fruits, veggies, whole grains, beans, nuts, and seeds. These foods have both types of fiber, so you'll get what you need without worrying about the details. 

Health Benefits of Fiber

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Fiber is like a superhero for your health! First, it keeps your digestion running smoothly by preventing constipation and keeping things moving. Second, it adds bulk to your stool, making bathroom trips easier and more regular.

Fiber helps you manage your weight by making you feel full and satisfied. That means you're less likely to snack on unhealthy stuff and more likely to keep your calories in check.

Fiber also helps control your blood sugar levels, which is important, especially if you have diabetes or want to avoid it. It slows down the absorption of sugar into your bloodstream, preventing glucose spikes.

Fiber is also great for your heart. It can lower your cholesterol levels, reducing your risk of heart disease and stroke. Soluble fiber is like a sponge that soaks up cholesterol in your gut, keeping it from getting into your bloodstream.

Last but not least, fiber is a friend to your microbiome! It feeds the good bacteria in your gut, keeping it healthy and happy. A healthy gut means better digestion, a stronger immune system, and overall better health.

Fiber and Disease Prevention

Fiber is your body's best friend when it comes to warding off some serious health issues like diabetes, colorectal cancer, and heart disease. Let's break it down.


Soluble fiber, found in foods like oats, beans, and fruits, is particularly beneficial for heart health due to its cholesterol-lowering effects. When you consume soluble fiber, it dissolves in water to form a gel-like substance in your gut. This gel-like substance then binds to cholesterol, preventing it from being absorbed into your bloodstream.

Soluble fiber helps reduce the levels of LDL cholesterol, often referred to as "bad" cholesterol, in the blood by preventing its absorption. High levels of LDL cholesterol can lead to the buildup of plaque in the arteries, a condition known as atherosclerosis. Atherosclerosis can restrict blood flow to the heart and brain, increasing the risk of heart disease and stroke.


Fiber is crucial in managing blood sugar levels, making it a valuable tool for preventing and managing type 2 diabetes. When you consume foods rich in fiber, such as fruits, vegetables, whole grains, legumes, nuts, and seeds, the fiber slows down the digestion and absorption of carbohydrates.

This slowdown in digestion means that sugars are released into the bloodstream more slowly and steadily, preventing rapid spikes in blood sugar levels. For those already living with type 2 diabetes, a high-fiber diet can help manage blood sugar levels and reduce the need for insulin or other diabetes medications. Because of the blood sugar stabilizing effect, fiber can even help prevent the complications associated with diabetes, such as nerve damage, kidney disease, and vision problems.

Colorectal Cancer

And let's not forget about colorectal cancer. Fiber, especially the insoluble kind, adds bulk to your stool, making it move faster through your digestive system. This means that harmful substances spend less time hanging out in your colon, lowering your risk of developing cancerous growths.

Mental Health

Fiber can also positively affect mental health. Gut health can influence mental well-being through the production of serotonin. Serotonin is a neurotransmitter that plays a key role in regulating mood, anxiety, and sleep. Surprisingly, the majority of serotonin in the body is produced in the gut, specifically in the enterochromaffin cells of the intestinal lining. Fiber intake is closely linked to serotonin production in the gut. Fiber helps promote the growth of certain bacteria that are involved in serotonin production. Therefore, a fiber-rich diet can indirectly support healthy serotonin levels, which may help improve mood and mental well-being.

Skin Health

Fiber-rich foods can significantly promote healthy skin by supporting the body's natural detoxification processes. Because fiber promotes regular bowel movements, waste is efficiently eliminated from the body, so harmful substances are less likely to build up and affect skin health. This can help prevent conditions like acne and promote a clear, glowing complexion.

Bone Health

Certain fibers, like inulin and oligofructose, can improve calcium absorption and contribute to better bone density by increasing the production of short-chain fatty acids and stimulating the production of hormones involved in calcium metabolism. Additionally, fiber can help protect against bone loss and osteoporosis by reducing inflammation and providing essential nutrients for bone health.


Numerous studies have shown that a high-fiber diet is associated with a longer lifespan and a reduced risk of chronic diseases. Inflammation and oxidative stress are key factors in the development of aging and age-related diseases such as cardiovascular disease, cancer, and neurodegenerative diseases. Fiber-rich foods contain various compounds, including antioxidants and phytochemicals, that can help reduce inflammation and oxidative stress. 

For example, soluble fiber has been shown to reduce levels of C-reactive protein, a marker of inflammation in the body. By reducing inflammation and oxidative stress, fiber may help protect against age-related damage to cells and tissues, ultimately contributing to a longer and healthier life.

<p class="pro-tip"><strong>Also Read: </strong><a href="paleo-meal-plan">7-Day Paleo Meal Plan for Beginners</a>.</p>

How to Increase Fiber Intake

three bowls of hummus on top of a wooden table.

Incorporating more fiber-rich foods into your diet can be easier than you think, and it's important to do so gradually to avoid digestive discomfort, allowing your digestive system to adjust. Drinking plenty of water can also help prevent constipation and bloating associated with increased fiber intake.

Start by adding a serving of fruits or vegetables to each meal or snack. For example, top your morning cereal with berries, add extra vegetables to your lunchtime salad or sandwich, and snack on raw vegetables with hummus or fruit with nut butter.

Whole grains are another great source of fiber. Choose whole-grain bread, pasta, and rice instead of their refined counterparts. Look for products labeled "whole grain" or "whole wheat" to ensure you get the most fiber.

Legumes, including beans, lentils, and chickpeas, are also excellent sources of fiber. Add them to soups, stews, salads, or pasta dishes for an easy fiber boost.

Nuts and seeds can be sprinkled on yogurt, salads, or oatmeal for added fiber and crunch. They also make a convenient and satisfying snack on their own.

Fiber Supplements

Fiber supplements can be a convenient option for individuals who struggle to meet their daily fiber needs through diet alone. These supplements come in various forms, including powders, capsules, and chewable tablets, and can help bridge the gap between your current fiber intake and the recommended amount.

When choosing a fiber supplement, it's essential to consider the type of fiber it contains. Look for supplements that contain soluble fiber, such as psyllium husk or inulin, as these types of fiber are known for their ability to lower cholesterol levels and regulate blood sugar levels. Additionally, opt for supplements that are free from added sugars, artificial flavors, and colors.

To incorporate a fiber supplement into your diet, start by reading the label and following the recommended dosage instructions. To avoid digestive discomfort, gradually increase your fiber intake to avoid digestive discomfort, so start with a small amount and gradually increase it over time. You can mix fiber powders into water, juice, or smoothies or take fiber capsules with a glass of water.

It's also important to continue eating a balanced diet rich in fruits, vegetables, whole grains, legumes, nuts, and seeds while taking a fiber supplement. Fiber supplements should complement your diet, not replace it. 

The Bottom Line

In conclusion, fiber is a vital nutrient with numerous health benefits. It plays a key role in digestive health, weight management, blood sugar control, heart health, and gut health. You can improve your overall health and well-being by incorporating more fiber-rich foods into your diet, such as whole grains, fruits, vegetables, legumes, nuts, and seeds.

Prioritize fiber-rich foods in your diet and make small changes to increase your fiber intake gradually. Your body will thank you for it, and you'll be on your way to a healthier, happier you.

Learn More About Healthy Nutrition With Signos’ Expert Advice

Choosing fiber-rich foods can improve your overall health and well-being. Getting the right amount of nutrients can seem challenging, but Signos’ experts are here to help. Our science-based approach to nutrition and healthy habits can give you more energy, help you lose weight, and improve your health. Click here to learn if Signos is the right fit for you.

<p class="pro-tip"><strong>Learn More: </strong><a href="carnivore-diet">What Is the Carnivore Diet? Benefits and Risks</a>.</p>

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About the author

Kristen Carli is the owner of Camelback Nutrition & Wellness. She graduated from University of Arizona with a BA in psychology and then received a BS in dietetics from Arizona State University.

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