Everybody's Talking About Fiber Now
Last year I told anyone who would listen that 2026 would be the year fiber had its wellness influencer moment. That everyone who had been obsessing over protein would suddenly pivot to fiber like they had just discovered it. And here we are. Fibermaxxing is officially a thing. Welcome to the conversation, everyone.
Most people, and most women in particular, are not eating nearly enough fiber. And what adequate fiber actually does for your body is a lot more interesting than the wellness world is giving it credit for.
What Even Is Fiber
Fiber is a type of carbohydrate that your body cannot digest. Unlike proteins, fats, and other carbs, fiber passes through your digestive system largely intact. The fact that your body cannot break it down is exactly what makes it so useful.
There are two main types and both are vital to your nutrition.
Soluble fiber dissolves in water and forms a gel-like substance in your digestive tract. This slows digestion, helps you feel full longer, and blunts blood sugar spikes after meals. Good sources include oats, apples, citrus fruits, beans, lentils, sweet potatoes, chia seeds, and flaxseed.
Insoluble fiber does not dissolve in water. It adds bulk and helps things move through your digestive system efficiently. This is the type most associated with digestive regularity and colon health. Good sources include nuts, seeds, avocado, broccoli, carrots, berries, the skins of fruits and vegetables, and quinoa.
You need both. They do different things and they work together. Focusing only on one is like trying to run your car on half an engine.
How Much Do Women Actually Need
The standard recommendation for women is 25 grams per day. But research increasingly suggests that is a floor, not a ceiling. I recommend women aim for 25 to 35 grams daily, and it's even better to push toward that higher end of the range, especially as you move through perimenopause and beyond.
For context, the average American woman gets somewhere around 12 to 15 grams per day. Which means most of us are running at less than half of what we need.
One important note: if your fiber intake is currently on the lower end and you decide to dramatically increase it overnight, your gut is going to let you know it is not happy. Bloating, gas, and general digestive drama are common when you add fiber too fast. Add it gradually over a few weeks, drink more water as you do, and give your body time to catch up.
The Cholesterol Connection
According to a large meta-analysis of 181 randomized controlled trials published on PubMed, every five gram daily increase in soluble fiber produced a significant reduction in LDL cholesterol, which is the kind we want to keep lower. A separate review published through the National Institutes of Health found that soluble fiber is associated with reduced lipid levels, lower blood pressure, improved blood sugar control, and reduced inflammation.
The way it works is that soluble fiber binds to bile acids in your digestive tract. Your liver uses cholesterol to make bile acids, so when fiber helps remove them from your body, your liver pulls more cholesterol from your blood to make new ones. LDL goes down as a result.
Specific types of soluble fiber with the strongest evidence for cholesterol reduction include psyllium, beta-glucan found in oats, pectin found in apples and citrus, and the fiber in legumes and beans.
Fiber and Your Gut Microbiome
Your gut bacteria need to eat and their primary food source is fiber. When they are well fed they produce compounds that support your gut lining, your immune system, and even your mood. It is a whole ecosystem in there and fiber is what keeps it running.
Research published through the American Gut Project found that people who eat 30 or more different kinds of plants per week have a more diverse gut microbiome than those who eat fewer. It is not just about eating more fiber. It is about eating different kinds, because different bacteria are fed by different sources.
Thirty different plants a week sounds like a lot until you realize that herbs, spices, nuts, seeds, and legumes all count. A smoothie with spinach, mixed berries, and ground flaxseed is already three. A salad with five different vegetables plus pumpkin seeds is another six. It adds up faster than you think.
Eat the Rainbow and Mean It
Different colored plants contain different types of fiber. Red and orange foods feed different gut bacteria than dark leafy greens, which differ again from purple foods like eggplant and blueberries. Eating across the whole color spectrum is how you build a diverse and resilient microbiome. A psyllium supplement gives you one type of fiber. A varied whole food diet gives you dozens.
A Quick List of High Fiber Foods to Focus On
Soluble fiber: Oats, apples, oranges, pears, beans, lentils, chickpeas, sweet potatoes, okra, eggplant, ground flaxseed, chia seeds, psyllium husk, avocado
Insoluble fiber: Nuts, seeds, berries, broccoli, cauliflower, carrots, quinoa, the skins of fruits and vegetables, dark leafy greens
Foods that give you both: Berries, avocado, pears, broccoli, oats, legumes, quinoa, ground flaxseed, chia seeds, sweet potatoes
The Bottom Line
Fiber is not a trend. It has been one of the most important and most undereaten nutrients for decades. It is good news that it is finally getting attention. And hey, fibermaxxing is kind of a fun word to say.
Eat more of it. Eat a wider variety of it. Eat across the colors of the rainbow. And understand that when you do, you are not just helping your digestion. You are feeding an entire ecosystem that runs more of your health than most people realize.