Can Eating More Fiber Help You Sleep Better?

Fiber is a macronutrient commonly associated with better digestive health. Eating enough of this complex carbohydrate also has a host of other wellness perks, including better heart health, lower blood sugar, and even improved sleep.

“Dietary fiber supports sleep through several interconnected biological pathways,” says Saema Tahir, MD, a certified sleep specialist and pulmonary disease specialist based in New York City. These may include the gut-brain axis, blood glucose levels, and overall levels of systemic inflammation, Dr. Tahir adds — all of which likely tie into how well we rest at night.

What Research Shows About Fiber and Sleep

While the scientific evidence connecting fiber and better sleep is growing, more studies are still needed to firmly establish a direct link. Current research shows an association between fiber and better sleep — as well as a lower risk of sleep disorders.

“There is no specific fiber prescription exclusively for sleep improvement, but evidence suggests a dose-dependent relationship between fiber intake and sleep outcomes,” says Tahir: “Meaning higher intake is associated with better sleep.”

How Fiber May Improve Sleep

At first glance, it may not seem like fiber and sleep could be related. In fact, they’re connected through multiple processes, from the digestive system to hormone production.

It Supports Gut Health

Fiber helps promote this dialogue by producing short-chain fatty acids that help regulate sleep-inducing neurotransmitters, says Alex Dimitriu, MD, a double board-certified sleep medicine doctor and the founder of Menlo Park Psychiatry & Sleep Medicine in California.

This explains why a healthy gut microbiome helps maintain a stable circadian rhythm in the body, says Dr. Dimitriu.

It Helps Stabilize Blood Sugar

“Dramatic dips in blood sugar can be a contributor to those 3 a.m. wake-ups,” says Meridan Zerner, RDN, a health and wellness coach based in Dallas. “This can be particularly frustrating for women in midlife, because glucose regulation is already challenged due to hormonal changes.”

It Helps Reduce Inflammation

Supports Sleep Hormones

How Much Fiber Do You Need?

“I generally recommend 25 to 35 g of fiber per day,” Dimitriu says. “While there is no specific ‘sleep dose,’ meeting these daily requirements is sufficient to see improvements in sleep quality.”

• Fruits like raspberries, pears, apples (with skin), bananas, oranges, and strawberries
• Vegetables like peas, broccoli, turnip greens, Brussels sprouts, and potatoes with skin
• Grains like whole-wheat pasta, barley, bran flakes, quinoa, oatmeal, and brown rice
• Legumes, nuts, and seeds like split peas, lentils, chia seeds, almonds, and pistachios

4 Tips to Boost Fiber for Better Sleep

Here’s how experts suggest gradually increasing your fiber intake to support a balanced diet that may help you sleep better at night.

1. Start with simple swaps. “Replace refined grains with whole-grain alternatives and add vegetables to each meal,” Tahir says. Refined grains contain the entire grain and are a good source of dietary fiber, whereas most refined grains contain little or no fiber.

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2. Get fiber from a variety of foods. Fit in as much variety as you can from foods like broccoli, artichokes, leafy greens, lentils, beans, berries, oats, or quinoa, says Zerner. “There is no one source of fiber that has been shown to be a major difference maker [for sleep], likely because different foods feed different microbes,” Zerner says.

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3. Enjoy fruit for snacks and dessert. Dimitriu suggests thawing frozen mixed berries by day and eating them with chia or flaxseeds as a dessert after dinner. You can also try pairing fruit with yogurt or making your own DIY fruit popsicles.

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4. Stay hydrated. “This allows the gut microbiota to adapt and reduce gastrointestinal discomfort,” Tahir says. Since fiber acts like a sponge in the digestive tract, it needs water to pass smoothly.

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The Takeaway

• High-fiber diets may improve sleep by supporting gut health, stabilizing blood sugar, reducing inflammation, and helping the body produce sleep-related hormones like serotonin and melatonin.
• Research has found higher fiber consumption is associated with deeper sleep, fewer nighttime awakenings, and a lower risk of sleep disorders, though more research is still needed to show how fiber directly improves sleep.
• Experts recommend gradually adding fiber from a variety of foods — whole grains, fruits, vegetables, legumes, nuts, and seeds — while staying hydrated, aiming for roughly 2,528 g per day for women and 28 to 34 g per day for men.