The health of the gastrointestinal system, as well as weight management, has been receiving increasing attention lately. We often look for the magic pill that can solve the problem; however, “nothing comes alone.”

The reality is that “easy” solutions are usually accompanied by several side effects, while “difficult” solutions, which are often the most natural, usually require quite a bit of patience before results are achieved.

These natural solutions are none other than dietary fiber, which is naturally found in foods, as well as in specially formulated dietary supplements. Let’s take a closer look at them to learn about their benefits and which foods contain them, so that we can incorporate them into our diet.

The 10 Foods Highest in Fiber

The World Health Organization (WHO) recommends consuming at least 25 g of dietary fiber per day for adults. Foods that can contribute to achieving this target include the following:

More specifically, here are the characteristics of the foods listed above:

1. Psyllium

Psyllium is considered the king of dietary fiber, as most of it consists of fiber. It is highly effective in supporting intestinal motility and can significantly help with constipation. It dissolves easily in water or juice and can be consumed immediately.

Extra Tip: If your goal is to address constipation, you can combine it with natural aloe vera juice, which can also help support intestinal motility.

2. Wheat Bran

Wheat bran is rich in dietary fiber, while also providing B vitamins, zinc, and magnesium.

Bran can be used as an ingredient in smoothies as well as in baked goods such as bread, muffins, and cookies, increasing their nutritional value and providing greater satiety after consumption.

3. Chia Seeds

In addition to their high fiber content, chia seeds are rich in omega-3 fatty acids, which have strong anti-inflammatory properties as well as an independent positive effect on the lipid profile (cholesterol and triglycerides).

They make an excellent addition to your favorite yogurt bowl with fresh fruit, oats, and honey.

4. Flaxseed

Most people know flaxseed as an excellent source of plant-based omega-3 fatty acids, used by both vegetarians and non-vegetarians as a nutritional supplement.

At the same time, however, it is also a rich source of dietary fiber. It can be added to salads, homemade granola, or even bread, providing additional important nutritional benefits.

5. Chickpeas

Chickpeas provide 19 g of plant-based protein per 100 g of dry product and are an excellent choice due to their multiple benefits. They also provide a blank canvas, as they can be prepared in many different ways.

Some alternative ways to use chickpeas include hummus (cooked chickpeas blended with olive oil, salt, and lemon juice using a stick blender) and homemade chickpea fritters (falafel).

6. Beans

Beans are a plant-based option that provides 21–23 g of plant-based protein per 100 g of dry product, along with a high amount of dietary fiber.

You can enjoy them in their classic form, the traditional Greek bean soup (fasolada), or put a twist on them by serving them as a bean salad with Florina peppers in brine, boiled egg, olives, yogurt dressing, and carob rusks.

7. Lentils

With 25 grams of dietary fiber and iron, lentils are a true superfood of the Greek land and an integral part of the Mediterranean Diet.

It is important to note that the iron found in lentils (non-heme iron) has lower absorption compared with the iron found in meat (heme iron). Therefore, it is important to combine lentils with lemon juice when serving them, as the vitamin C content helps improve iron absorption.

Finally, it is important to combine all legumes with a source of grains (rice, bread, rusks, croutons, corn, etc.) in order to achieve a higher and more complete amino acid profile.

Learn more: Vitamin C: The Key to Health and Well-Being

8. Almonds

Like most nuts, almonds contain monounsaturated fatty acids that support cardiovascular health and the lipid profile.

An important note regarding almonds and nuts in general is that they should be consumed in moderation, as they are calorie-dense foods, meaning that even a small amount can add a significant number of calories to a meal.

Learn more: Almonds: Benefits, Properties & Nutritional Value

9. Pumpkin Seeds

Along with their fiber content, pumpkin seeds provide zinc, an important trace element for the effective functioning of our immune system (particularly during the winter months or periods of frequent viral infections). They also contain naturally occurring tryptophan, a substance that can support relaxation and better-quality sleep.

They can easily be incorporated into the diet, just like chia seeds and flaxseed, and can also be used as an ingredient in homemade bars.

10. Oats

Oats contain minerals and trace elements. However, in addition to their fiber content, their beta-glucan content is equally important, as beta-glucans contribute to maintaining normal cholesterol levels and better glycemic control.

11. Whole-Wheat Bread

Like pasta, bread, when consumed in its whole-grain form—meaning that the outer layer of the grain is retained during milling—provides both a high amount of dietary fiber and B vitamins, which support the proper functioning of the nervous system and energy-production mechanisms.

Other foods rich in dietary fiber include organically grown fruit that is eaten with the skin, such as apples and pears; berries such as blueberries; vegetables such as zucchini, carrots, lettuce, broccoli, cauliflower, and peppers; as well as starchy foods such as whole-wheat pasta, brown rice, whole-grain cereals, and sweet potatoes.

What Is Dietary Fiber?

Dietary, or plant-based, fiber consists of components of plant foods that the human digestive system is unable to absorb. In other words, they pass through the small intestine almost unchanged and undergo partial or complete fermentation in the large intestine, which is also the part of the human body with the highest concentration of microorganisms.

Dietary Fiber: Properties and Benefits for the Body

But how exactly does dietary fiber help our body, and what benefits does it provide?

1) It Improves Bowel Function

Dietary fiber supports normal intestinal motility and contributes to the prevention and/or management of constipation.

2) It Supports a Healthy Gut Microbiome

Since dietary fiber serves as “food” for beneficial intestinal bacteria, increased fiber intake contributes to a richer and more diverse gut microbiome.

3) It Helps Regulate Blood Glucose Levels

Fiber slows down digestion and carbohydrate absorption, resulting in a more gradual increase in post-meal blood glucose and insulin levels.

4) It Helps Regulate Cholesterol Levels

During the digestion of food, bile acids are naturally released into the small intestine. These are produced by the body from cholesterol. Dietary fiber binds to bile acids and carries them into the large intestine, where they are eliminated. The body is then required to produce new bile acids using the cholesterol it has internally, thereby reducing cholesterol levels in the bloodstream.

In the absence of dietary fiber in a meal, bile salts are reabsorbed by the small intestine and reused. As a result, the body does not need to produce new bile acids, and cholesterol levels are ultimately not affected.

5) It Increases Feelings of Satiety

Dietary fiber delays gastric emptying, helps improve appetite and hunger control, and contributes to weight loss.

6) It Contributes to the Prevention of Chronic Diseases

Adequate fiber intake has been associated with a lower risk of developing:

• Type 2 diabetes
• Cardiovascular diseases
• Obesity
• Diverticular disease
• Colorectal cancer

How Much Fiber Do We Need Per Day?

The WHO recommends total daily fiber intake according to age group, as shown below:

It is important to note that the ideal daily intake according to the WHO is 25 g per day. In certain situations, such as during a weight-loss period or in cases of elevated cholesterol, this recommendation may need to increase to 30–35 g per day.

Dietary fiber is an essential part of a balanced diet and contributes significantly to health and well-being. At Βιολογικό Χωριό, you will find a wide variety of organic products packed with nutrients, including fruit and vegetables, nuts, whole-grain products, and many more fiber-rich options, so you can easily and naturally enrich your diet with fiber.

Manos Smyrlakis
Dietitian-Nutritionist

References

Neuenschwander M, et al. BMJ. 2019. “Role of diet in type 2 diabetes incidence: Umbrella review of meta-analyses of prospective observational studies.”

Veronese N, et al. Clinical Nutrition. 2025. Umbrella Review.

Fu L, et al. Frontiers in Nutrition. 2022. Umbrella Review.

Aune D, et al. European Journal of Nutrition. 2020. Systematic Review & Meta-analysis.

World Health Organization. (2023). Carbohydrate intake for adults and children: WHO guideline. Geneva: World Health Organization.