Tatiana Nakryzhskaya
Back to the blog

24 September 2026 · 4 min read

Colorectal cancer prevention: the simple rule of 25 grams of fiber a day

Colorectal cancer prevention: the simple rule of 25 grams of fiber a day
My dear readers. Today I want to remind you once again of the importance of colorectal cancer prevention — this cancer has become dominant among oncological diseases in Europe. And it no longer affects only people over 60. Prevention of this disease is quite simple. Yet not a single one of my patients follows the simple rule — at least 25 grams of fiber per day. Below I provide the rationale for this well-established, FDA-recommended norm.
Why do we need fiber, and should it be taken as supplements?Only 5% of adults get enough fiber from food. On average we consume just 15 g per day, while we need 25–35 g! Hence constipation, digestive disorders and general malaise.
Why take fiber supplements?They regulate bowel movements and prevent constipationThey relieve symptoms of IBS, IBD and even mild diarrheaThey support heart and kidney health, blood sugar and cholesterol levelsThey help control weight and reduce cancer riskThey boost immunity and overall wellbeing
What kinds of fiber are there?Soluble — from plant pulp. Forms a gel, slows digestion, feeds beneficial bacteria. Examples: oats, apples, psyllium, legumes, citrus fruits, broccoli.Insoluble — from skins, seeds and grains. Speeds up the passage of food and increases stool volume. Examples: fruit skins, nuts, wheat bran, beans, green vegetables.
Supplement forms: powders, capsules, chewable tablets, bars.Take with 1 glass of water + drink water throughout the day!
Side effects:A sudden start may cause bloating, gas, cramps. Start with small doses! Avoid overdosing — excess fiber can harm the digestive tract.
The best approach is to choose the type and dose of fiber together with a specialist. Especially if you have chronic conditions.

Share

Facebook Telegram

Ready to look at your health differently?

Book a consultation

Tatiana Nakryzhskaya

MD, PhD, CFMP

Preventive and functional medicine in Prague. Clinical experience since 1991.

Navigation

Contact

Prague, Czech Republic

info@tatiananakryzhskaya.com

In-person and online consultations are available.

© 2026 Tatiana Nakryzhskaya, MD, PhD, CFMP. All rights reserved.

The information on this website is for reference only and does not replace a medical consultation.

Privacy Policy

Cookies

We use necessary cookies to make the site work. With your consent we also use analytics cookies (Microsoft Clarity) to understand how visitors use the site. No advertising tracking is used.

Privacy Policy