Fiber for Lifters: Why High-Protein Diets Need More of It

If your diet is built around chicken, rice, eggs, and protein shakes, you're probably nailing your protein and coming up short on fiber. Protein foods carry almost none of it, and when protein takes up most of the plate, fruits, vegetables, and whole grains get squeezed out.

That's a real gap, and it's common. Here's why lifters need to pay attention to fiber, how much to aim for, and how to close the gap with food first and a supplement if you need one.

Most People Fall Short on Fiber

A study presented at the American Society for Nutrition's NUTRITION 2021 meeting found that just 7% of U.S. adults meet fiber recommendations. Broken down, that was only 5% of men and 9% of women.

That's the general public. Now picture a lifter running a high-protein, low-produce meal plan. The odds of hitting your fiber number don't get better from there.

Why High-Protein Diets Run Low on Fiber

Fiber comes from plants: vegetables, fruit, beans, and whole grains. Meat, eggs, and whey have essentially none. So the more of your daily calories come from protein foods, the less room you leave for the foods that actually carry fiber.

A few common lifter habits make it worse:

• White rice as the go-to carb. The same ASN article notes a cup of pearled barley has 6 grams of fiber, compared to less than 2 grams in white rice.
• Shakes replacing meals. A protein shake fills a protein gap. It usually doesn't bring fiber with it.
• Low-fiber carbs around training. Easy-to-digest carbs like cream of rice are popular before a session for a reason. They're light on fiber by design, which is fine around workouts, but it means fiber has to come from somewhere else.
• Cutting phases. When food volume drops, vegetables and fruit are often the first things to go.

Why Lifters Should Care

Fiber supports regular digestion and helps you feel full between meals. Both matter when you're eating big to grow or eating less to cut.

• Regularity. Bulk-forming fibers like psyllium absorb water and support regular bowel movements, which is not a small thing on a heavy-protein diet.
• Fullness. Fiber slows digestion and supports feelings of fullness, a useful tool when you're in a calorie deficit.
• Gut support. Prebiotic fibers like inulin and FOS feed the beneficial bacteria in your gut.

How Much Fiber Do You Need?

According to the ASN, health guidelines recommend 14 grams of fiber for every 1,000 calories you eat. For a typical woman on 2,000 calories, that's about 25 grams. For a typical man on 2,500 calories, it's about 38 grams.

The math scales with your intake, so a lifter eating 3,000 calories a day is looking at about 42 grams. That's a lot of broccoli.

Food First, Then Fill the Gap

A supplement won't replace real food, and it shouldn't. Start with easy swaps:

• Trade some white rice for a higher-fiber grain like barley.
• Add a vegetable to every meal, even if it's frozen.
• Keep fruit around for snacks.
• Toss beans or lentils into your rotation a few times a week.

If you've done that and still can't get close to your number, a fiber powder is a simple way to fill what's left. Most mix into water or a shake.

Fiber Supplements Worth a Look

• Revive MD Fiber: 7g of dietary fiber per scoop from oat flour and psyllium husk, giving you both soluble and insoluble fiber. Vegan, gluten-free, and soy-free, with 30 servings in Chocolate or Unflavored.
• 5% Nutrition Core Fiber: 8g of fiber per scoop from four sources: 3,000mg Fibersol soluble corn fiber, 2,500mg FOS, 2,500mg polydextrose, and 1,000mg psyllium husk. 35 calories per scoop and 30 servings.
• Project AD Fiber+: a fiber blend built on psyllium husk and Fibersol-2, plus a 12-strain probiotic blend. Vegan, 30 servings, in Chocolate, Strawberry Banana Smoothie, and Mango.

In-Store Pick: 1st Phorm Multi-Fiber

1st Phorm Multi-Fiber packs 9g of dietary fiber per scoop from three sources: Fibersol-2 soluble corn fiber, psyllium husk, and inulin. It comes in Chocolate, Mixed Berry, and Unflavored, with 30 servings per container, and 1st Phorm lists it as gluten free, dairy free, and vegan friendly. The Unflavored version can go right into your protein shake. It's available at all six Get Yok'd stores and in the Get Yok'd app, not on the website.

How to Start Without Regretting It

• Go slow. Jumping from low fiber to a lot overnight can leave you gassy and bloated. 5% Nutrition suggests starting with half a scoop. Revive MD says to take one scoop a day to assess tolerance.
• Drink more water. Psyllium works by soaking up water. Revive MD recommends at least 3 liters of water a day with its fiber.
• Follow the label. Serving sizes and directions differ between products.

Who Should Skip It

• Anyone already hitting their fiber number from food. You don't need to pay for what you're already eating.
• Anyone under 18, unless a doctor says otherwise.
• Anyone with a digestive condition or who takes prescription medication, until they've checked with their doctor.

Common Questions

Can I mix fiber powder into my protein shake?

Yes. Unflavored fiber is the easiest to hide in a shake. Just drink extra water through the day, since many fibers absorb a lot of it.

Does cream of rice have fiber?

Very little, and that's part of why lifters like it before training. It digests easily. Just don't count on it toward your daily fiber.

Are fiber supplements as good as fiber from food?

No. Whole foods bring vitamins, minerals, and other nutrients along with the fiber. A supplement is for closing the gap, not replacing produce.

Will fiber slow down my protein absorption?

Fiber slows digestion in general, but your body still digests and uses the protein. Hitting your daily protein and fiber targets matters far more than timing.

The Bottom Line

High-protein diets are great for building muscle, but they push out the plant foods that bring fiber. Most adults already fall short. Eat more fiber-rich foods first, then use a fiber supplement to close what's left. Still sorting out the protein side? Read our guide to whey concentrate vs. isolate.

Want help choosing a fiber that fits your routine? Stop by any Get Yok'd store in Burbank, Glendale, the Glendale Galleria, North Hollywood, Pasadena, or Northridge. Or shop all fiber supplements online.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.