Fiber might not have the flashy appeal of protein. But when it comes to your health, fiber is definitely an overachiever. It promotes healthy digestion and regularity, helps manage blood sugar, can support weight management, and improves blood pressure and cholesterol (spelling good news for your long-term heart health). The problem? The vast majority of people don’t get enough of it each day.
“In my practice, I find that most individuals are consuming an average of 10 to 15 grams of fiber daily,” says Adrian Hernandez, MS, RDN, a certified gastrointestinal dietitian nutritionist and owner of AEH Nutrition LLC in Washington, DC. That range falls way short of official recommendations, which are 25 grams for women and 38 grams for men. But instead of going from 0 to 100, you’ll want to take a slow and steady approach to boosting your intake to avoid GI distress. “I always recommend starting with an evaluation of your average daily fiber intake and then increasing it by three to five grams every few days until your goal is met,” he says. “At this rate, most individuals can reach their target in about three to four weeks.”
Ahead, Hernandez outlines what you can expect on a week-by-week basis when you finally start to inch your way to your target number.
Week 1: The Adjustment Phase
The first week marks an adjustment phase—and it’s normal to feel a bit worse for wear. “You are getting used to concentrating on increasing your daily fiber intake and might experience more gas and bloating,” says Hernandez. In better news, you might also begin to feel more full than usual, or experience changes in the frequency and consistency of your bowel movements. (You might not be at a smooth Bristol 4 just yet, but you’ll get there in due time.)
Hernandez reiterates the importance of only boosting your fiber intake by about three to five grams at a time to avoid exacerbating any symptoms. (For reference, an apple, a tablespoon of chia seeds, and two slices of whole wheat bread fall within this range.) Increase your intake every few days or as your body adjusts. Also important: Hydrate like you mean it to move *things* along.
Week 2: Microbial Diversity and Fuel Production
By week two, “the increase in fiber and variety of soluble and insoluble sources is providing your gut microbiome with the fuel it needs to produce short-chain fatty acids that power your colon and support a healthy intestinal barrier,” says Hernandez. He adds that short-chain fatty acids play a role in regulating GLP-1 produced in the body, which can thus help manage hunger and blood sugar.
Week 3: Notable Changes
In case you haven’t noticed any major physical benefits, there’s a good chance you will by week three. By now, you might have increased your daily fiber intake to the recommended levels, and the benefits should start to shine. “Your bowel movements should be trending toward a solid and smooth move with little to no digestive side effects,” says Hernandez. In addition, your satiety and hunger cues should feel well managed, and you may feel less inclined to snack throughout the day. (Better yet, perhaps your sweet tooth has gone missing.)
Week 4: Consistency Showing Results
By the time you make it to week four, the benefits should feel noticeable. Perhaps you’ve even lost a few pounds. “Hunger and fullness continue to be regulated, resulting in better managed dietary intake,” Hernandez says. Since more fiber can crowd out less-than-healthy snacks and treats, you may also find that you have more energy and simply feel better in your body.
The Bottom Line
Most of us would do ourselves a solid (no pun intended) to eat more fiber. The goal isn’t to hit your daily target straight away, but rather to build your way up to it. And for those who want extra credit, you don’t need to stop at 25 or 38 grams. According to Hernandez, the more is the merrier to improve outcomes for blood sugar control, cardiovascular health, and to prevent GI diseases, among other benefits. So go ahead and lean into fibermaxxing, and remember that slow and steady wins the good-for-your-gut race.
