10 Best Prebiotic Foods to Eat to Support Gut Health

Onions are an ingredient in many popular dishes. The great news is they contain prebiotics, specifically inulin and fructooligosaccharides, both of which cannot be digested by the human body. Instead, they stay in the bowel and help the good bacteria thrive, supporting a healthy digestion and gut microbiome. Raw and cooked onions are both sources of prebiotics. One study confirmed the prebiotic effects of onion on probiotic cells.

There are many varieties of onions that pack in both antioxidants and anti-inflammatory properties to fight free radicals in the body and support overall health. There are also other health benefits of onions: The high amount of vitamin C adds a nutritional punch that makes the onion an immune-supporting food, just like prebiotics. In one cup of chopped onions, you’ll meet about 10% of the daily value. Now that’s something to cry happy tears about.

Add onions to your breakfast omelet, a delicious spring salad or a savory onion tart.

Garlic is part of the Allium family and is closely related to shallots, leeks and onions. The fructans found in garlic are what give it its prebiotic effects. A report published in The Scientific World Journal describes fructans to be health-promoting food ingredients that act as prebiotics in the gut. "They're also antimicrobial and help balance blood sugar," says Zibdeh.

There are additional health benefits of garlic: You'll find traces of micronutrients like manganese, vitamin B6 and potassium, and garlic is known to protect against the common cold due to its naturally-occurring bioactive compounds.

It’s best eaten raw as it preserves all its beneficial nutrients compared with cooked garlic. Crush or mince a clove and make a flavorful salad dressing, chunky salsa or a white bean dip.

Unpeeled apples are naturally high in pectin. Pectin is recognized as a prebiotic that is not broken down by human saliva or gastric acid and is resistant to digestive enzymes pepsin, trypsin and rennet.

Instead, it makes a gel in your digestive tract after ingestion, a function that provides numerous health benefits like improving cholesterol levels. Pectin does this by binding with cholesterol in the digestive tract, which keeps it from being absorbed in the body and thereby supports cardiovascular health.

You can enjoy an apple by itself, chop it up to add to steel-cut oats or make this Seared Steak With Apple Salad and Horseradish Vinaigrette.

Bananas are one of the most perfect on-the-go snacks! Not only are they an excellent source of potassium and carbohydrates, they also provide gut-thriving prebiotics.

One study found that green or underripe bananas have bioactive compounds, including phenolics and phytosterols, and contain resistant starch, a type of prebiotic present in both the pulp and peel that is beneficial to colon health. In addition, they are a source of food for the probiotic bacteria Lactobacilli.

Prebiotic foods can also help improve your mental health. "A study published in Brain, Behavior, and Immunity found that a diet high in prebiotics was linked with improved mood and cognition," says Méndez.

Dandelion greens are extremely high in inulin, a type of fiber known to encourage healthy bacteria to thrive. It’s also been shown to promote the movement of food through the gastrointestinal tract, supporting overall digestion. In fact, it has been used in traditional medicine for centuries as the go-to for constipation relief.

Dandelion greens are extremely nutrient-dense. They are an excellent source of vitamins C, A and K and have beta-carotene and polyphenol compounds which "help lower inflammation," says Zibdeh. Due to its bitter taste, it's often enjoyed cooked and paired with sweeter foods, such as fruit.

There are so many reasons to eat oats. Not only is it quick to make — you can cook it on the stovetop or just let it soak in the fridge for overnight oats — the resistant starches found in oats can multiply the good bacteria in the gut to help keep you feeling your best.

You may have heard that oats are good for heart health, and that is very true. One study suggests that the prebiotic activity of oats to modulate the gut microbiome contributes to its cholesterol-lowering effects. It may also help with blood sugar regulation, thanks to soluble fiber beta-glucan bringing in all the prebiotic activity.

This highly nutritious food is packed with key minerals like iron, folate, zinc. One cup of oats has 60% of the daily value for manganese, a mineral needed for the normal functioning of your brain and many of the body’s enzyme systems.

Try this Oatmeal with Yogurt and Toasted Almonds.

Raw asparagus counts as a prebiotic source, but if you don’t find it palatable, lightly sautéed stalks are still a great option that will deliver the prebiotic contents.

Asparagus has high levels of inulin, which is an indigestible fiber that feeds good bacteria like Lactobacilli and Bifidobacteria and adds bulk to the stool, supporting regular bowel movements.

You’ll also find high levels of B vitamins and key nutrients like folate, which protects against neural tube defects in pregnant women.

Flaxseeds are a versatile ingredient that has a mild, nutty and crisp consistency. They contain fiber and polyphenols called lignans, making them a prebiotic source. And there are other health benefits of flaxseed: It’s incredibly high in thiamine, a B vitamin that plays a key role in cell function and energy metabolism.

You’ll want to go for ground over whole flaxseed, since it’s much easier to digest. Whole flaxseed will pass through the intestines undigested, which means you won't get to enjoy all of the benefits it has to offer. If you’re dealing with constipation or want to help control your cholesterol levels, adding flaxseeds is a good idea, according to one small study.

Not sure how to enjoy it? Add a tablespoon to your hot breakfast cereal, mix it into yogurt with fruit or use it to make an egg substitute for vegan baking.

Jerusalem artichokes — also referred to as “sunchokes” — contain high amounts of inulin, a prebiotic that supports digestive function. Inulin stimulates the growth of beneficial bacteria, such as Bifidobacterium, according to a small trial reported in The American Journal of Clinical Nutrition.

Jerusalem artichokes are a good plant source of iron; just add vitamin C–rich foods like peppers and Brussels sprouts to help maximize the absorption since it’s an iron source that doesn't absorb well on its own.

They have a flavor like a sweeter, nuttier potato. To eat them, peel off the skin, shred them and sprinkle on a salad, roast them or blend them into a soup or a dip.

There are many health benefits of seaweed. Certain species, like Eucheuma Spinosum, are an emerging source of prebiotics because they are resistant to digesting enzymes and enhance gut microbial activity. Seaweed contains a significant amount of iodine — with just one serving, you can easily meet the daily recommended amount.

This versatile marine food is trending everywhere: You’ll find it in packaged snacks and in a variety of dishes from sushi rolls to soups, stews, salads and smoothies too.