Fiber, Fiber, Fiber!
Let’s talk fiber — because it’s one of those topics that doesn’t get nearly enough attention, yet it is so, so important.
Most Americans today are getting around 15 grams of fiber per day, when we really should be closer to 30 grams daily. If we look way back at our ancestors, they were likely getting closer to 100 grams of fiber per day. That alone tells us something important is missing.
So what’s all the talk about fiber, and why does it matter so much?
What Is Fiber, Really?
There are two main types of fiber, and they each play a different but equally important role in the body.
Insoluble Fiber
This type of fiber helps move stool through the colon. It adds bulk and keeps things moving, helping prevent constipation. I often think of insoluble fiber as the “movement fiber.”
Soluble Fiber
Soluble fiber is where a lot of the magic happens. This type of fiber feeds the good bacteria in our gut. When we feed our gut bacteria, they produce short-chain fatty acids, which are incredibly important for overall health.
Why Fiber Is So Important?
It helps produce short-chain fatty acids, which have a lot of important functions that include:
Provide energy for the cells of the colon
Strengthen the gut barrier
Help reduce inflammation
Support the immune system
Help regulate appetite and metabolism
Impact brain health
Play a role in long-term disease prevention
Fiber also plays a big role in detoxification. If we’re constipated, toxins don’t move out of the body efficiently — they get stuck. Fiber helps move waste through the body the way it’s meant to.
This is why, when I work with patients who need more fiber, I always recommend nutrition first.
Fiber, Inflammation, and the Immune System
Fiber doesn’t just help digestion — it directly impacts inflammation and immune health.
Higher fiber intake has been shown to help lower CRP (C-reactive protein), which is a nonspecific lab marker of inflammation we often see on blood work. Lower CRP reflects a more balanced inflammatory response, which in turn supports a healthier immune system.
Fiber also:
Lowers the glycemic index of meals, supporting better blood sugar control
Helps reduce the risk of obesity by improving fullness and appetite regulation
Promotes the growth of beneficial gut bacteria
Directly regulates immune function through the gut–immune connection
When the gut is supported, the immune system works better — it really is that connected.
How to Increase Fiber (Without Feeling Miserable)
A quick but important reminder: start slowly.
If you increase fiber too quickly, you may notice gas or bloating at first. That doesn’t mean fiber isn’t right for you — it just means your gut needs time to adjust. With consistency, this usually improves.
My Favorite Fiber-Rich Foods
I love foods that give you multiple benefits at once. The nutrients below do just that!
Soluble Fiber Sources
Oat bran (½ cup) – ~7.0 g
Black beans, cooked (¾ cup) – ~5.4 g
Lima beans, cooked (¾ cup) – ~5.3 g
Tofu (¾ cup) – ~2.8 g
Avocado (½ whole) – ~2.1 g
Brussels sprouts (½ cup) – ~2.0 g
Sweet potato, cooked (½ cup) – ~1.8 g
Asparagus, cooked (½ cup) – ~1.7 g
Insoluble Fiber Sources
Wheat bran (½ cup) – ~12.5 g
Navy beans, cooked (½ cup) – ~9.5 g
Kidney beans, cooked (½ cup) – ~8.2 g
Lentils, cooked (½ cup) – ~7.8 g
Black beans, cooked (½ cup) – ~7.5 g
Okra (½ cup) – ~3.1 g
Turnip, cooked (½ cup) – ~3.1 g
Peas (½ cup) – ~3.0 g
Yes — there’s overlap, and that’s a good thing.
Why These Foods Are Powerhouses
Avocado
High in fiber and rich in healthy essential fatty acids
Brussels sprouts
Fiber-rich greens that support detox pathways and gut health
Asparagus
A natural prebiotic that feeds beneficial gut bacteria and supports digestion
Often, you’re getting multiple benefits from one food choice, which is one of the things I love most about nutrition.
A Quick Note From Me
I genuinely love nutrition. Food is incredibly healing, and there are so many layers to it — the gut, the immune system, hormones, metabolism, and even brain health. Learning how food supports the body truly excites me.
If you have nutrition questions, want to learn more, or are interested in educational opportunities, I’m always happy to help. Nutrition doesn’t have to be overwhelming — often, small and simple changes make the biggest impact.
Final Thoughts
Fiber isn’t flashy. It doesn’t get the attention that supplements or trends do, but it is one of the most powerful foundations of health.
Start slow, focus on whole foods, and remember — consistency matters more than perfection.
References
Fiber content and food examples are based on data from reputable nutrition and research sources, including:
U.S. Department of Agriculture (USDA) – FoodData Central
USDA Agricultural Research Service – Food Composition Databases
Oregon State University, Linus Pauling Institute – Micronutrient Information Center (Dietary Fiber)
Fiber values reflect standard serving sizes and may vary slightly based on preparation and food sourcing.
Disclaimer
This information is for educational purposes only and is not intended to diagnose, treat, cure, or replace medical advice. Please consult your healthcare provider for individualized recommendations.
