The Top 16 Health Benefits of Grapes

Grapes deliver numerous health advantages, largely thanks to their rich supply of nutrients and antioxidants. They can support the eyes, heart, bones, and more.

Humans have grown grapes for millennia, with many ancient cultures valuing them especially for winemaking. Grapes also make a convenient, tasty snack whether you’re at home or out and about.

You’ll find grapes in a range of colors, including green, red, black, yellow, and pink. They appear in many forms — from raisins to jellies to juices — and come as seeded or seedless varieties.

The health perks of grapes mainly stem from their nutrient density and antioxidant profile.

Below are the top 16 health benefits associated with grapes.

Packed with nutrients

Grapes are a good source of several essential nutrients. Just 1 cup (151 grams) of red or green grapes supplies:

• Calories: 104
• Carbohydrates: 27 grams
• Protein: 1 gram
• Fat: 0.2 grams
• Fiber: 1.4 grams
• Copper: 21% of the daily value (DV)
• Vitamin K: 18% of the DV
• Thiamine (vitamin B1): 9% of the DV
• Riboflavin (vitamin B2): 8% of the DV
• Vitamin B6: 8% of the DV
• Potassium: 6% of the DV
• Vitamin C: 5% of the DV
• Manganese: 5% of the DV
• Vitamin E: 2% of the DV

Grapes are particularly rich in copper and vitamin K. Copper plays a role in energy production, while vitamin K is important for clotting and bone health.

They also contribute meaningful amounts of B vitamins like thiamine, riboflavin, and B6. Thiamine and riboflavin support growth and development, and B6 is essential for protein metabolism.

May support heart health

Grapes may promote cardiovascular wellness through several mechanisms.

May help lower blood pressure

One cup (151 grams) of grapes supplies 6% of the DV for potassium, a mineral that helps maintain healthy blood pressure.

Potassium appears to lower blood pressure largely by relaxing blood vessels. It may also aid sodium excretion and prevent vessel constriction that can raise blood pressure.

That said, a review of 32 studies found that both too little and too much potassium can be linked to hypertension. Researchers suggest aiming for the recommended daily intake of 4.7 grams.

May help reduce cholesterol

Certain components in grapes may protect against high cholesterol by lowering cholesterol absorption.

In an 8-week study from 2015 involving 69 people with elevated cholesterol, consuming 3 cups (500 grams) of red grapes daily lowered total and LDL (bad) cholesterol; white grapes did not show the same effect.

Moreover, diets richer in resveratrol — an antioxidant present in grapes — may help reduce cholesterol.

High in antioxidants

Antioxidants are molecules that help repair cellular damage caused by free radicals, which contribute to oxidative stress. Oxidative stress is linked to chronic diseases like diabetes, cancer, and heart disease.

Grapes are abundant in potent antioxidants, particularly in the skin and seeds. However, their levels can vary depending on variety, ripeness, storage after harvest, and environmental conditions, as noted here.

These protective compounds remain to some degree after fermentation, which explains why wine also contains antioxidants.

Some grape varieties are richer in anthocyanins, a group of antioxidant flavonoids that give grapes shades of orange, red, blue, pink, and purple. Studies in humans and animals indicate anthocyanins may help prevent or treat cardiovascular and brain disorders.

Other key antioxidants in grapes include resveratrol and quercetin, both of which may protect against heart disease, high blood sugar, and certain cancers.

Grapes also offer vitamin C, beta carotene, lutein, and ellagic acid — all strong antioxidants.

May have anticancer properties

Antioxidants found in grapes can help guard against certain cancers.

Resveratrol may act by reducing inflammation, serving as an antioxidant, and inhibiting cancer cell growth and spread.

Grapes also provide quercetin, anthocyanins, and catechins — antioxidants that may have anti-cancer effects.

Laboratory and animal studies show that grape extracts can hinder the growth and spread of human colon, prostate, and breast cancer cells.

Additionally, a 2-week study from 2015 involving 30 people found that individuals over 50 who consumed 0.3–1 pound (150–450 grams) of grapes daily showed reduced markers associated with colon cancer risk.

While more human research is required, diets rich in antioxidant-containing foods like grapes have been associated with lower cancer risk.

May help manage blood sugar and protect against diabetes

Grapes contain 23 grams of sugar per cup (151 grams), roughly equal to 22 seedless grapes, which raises questions about suitability for people with diabetes.

On the glycemic index (GI), which measures how quickly a food raises blood sugar, grapes score between 49 and 59, depending on the variety.

Definitions of low GI vary by source, with some considering under 55 to be low and others using under 50 as the cutoff.

Grapes’ GI places them in the low-to-medium range, meaning they can raise blood sugar gradually or moderately rather than causing a rapid spike.

Still, overeating low-GI foods can produce the same blood sugar impact as consuming high-GI foods, so moderation is important.

Some compounds in grapes may also improve markers of insulin function.

A review of 29 studies involving 1,297 adults found that grapes and grape-derived supplements significantly reduced HOMA-IR, a measure of insulin resistance.

Specifically, resveratrol may enhance insulin utilization by:

• reducing insulin resistance
• increasing insulin sensitivity
• protecting pancreatic beta cells that produce insulin
• improving insulin production
• helping maintain steady blood glucose levels

Long-term blood sugar control can lower diabetes risk and reduce complications related to diabetes.

May support eye health

Phytonutrients in grapes could help protect against common eye disorders.

A 2023 study in older adults in Singapore suggests regular grape consumption may benefit certain eye health indicators.

In a 2015 lab study, resveratrol protected retinal cells from ultraviolet A (UVA) damage, potentially lowering the risk of age-related macular degeneration (AMD).

One review notes that resveratrol might also defend against glaucoma, cataracts, and diabetic retinopathy.

Grapes also contain lutein and zeaxanthin, antioxidants that may help preserve eye health, sharpen visual performance, and ward off age-related eye issues.

May boost memory, attention, and mood

Consuming grapes may enhance memory and cognitive health.

In a 12-week trial from 2017, 111 older adults took 250 mg of a grape supplement daily and showed meaningful improvements in tests of attention, memory, and language versus baseline.

Another earlier study in healthy young adults found that drinking 7.8 ounces (230 mL) of grape juice improved mood and sped up memory-related tasks within 20 minutes.

In a 2015 animal study, four weeks of resveratrol intake improved learning, memory, and mood in rats and increased indicators of brain growth and blood flow.

Resveratrol may protect against Alzheimer’s disease by reducing brain inflammation and aiding the removal of amyloid-beta peptide, whose buildup is linked to the condition.

May support bone health

Grapes supply various minerals important for bone integrity, such as:

• potassium
• manganese
• vitamins B, C, and K, which help lower the risk of osteoporosis and fragile bones

Some evidence indicates resveratrol may enhance bone density.

A 2-year trial in postmenopausal women reported that 75 mg of resveratrol taken twice daily improved bone mineral density and slowed bone loss, lowering the risk of fractures.

Still, more human research on grapes’ effects on bone health is needed.

May protect against bacteria and fungi

Several grape constituents may defend against harmful microbes.

Resveratrol exhibits antimicrobial activity against bacteria and fungi like Campylobacter jejuni and Candida albicans.

It may also help prevent foodborne pathogens; when added to foods, resveratrol inhibits harmful bacteria such as E. coli.

Anthocyanins in grapes also show antimicrobial potential by disrupting bacterial cell walls.

Grapes are also a decent source of vitamin C, known for supporting immune function.

May slow aging signs and promote longevity

Phytonutrients in grapes may influence aging and lifespan.

Research indicates resveratrol can delay aging signs by mimicking calorie restriction benefits, such as lowering oxidative stress, boosting stress resilience, and improving inflammatory responses.

Keep in mind most of these effects have been observed in animals.

Resveratrol activates the SirT1 gene, which is engaged during low-calorie diets and is associated with longer lifespans.

It also activates sirtuin, a protein involved in cellular aging and programmed cell death.

May lower inflammation

While brief inflammation is a normal bodily reaction, chronic inflammation contributes to long-term illnesses such as cancer, heart disease, diabetes, arthritis, and autoimmune disorders.

Anthocyanins and resveratrol in grapes are associated with anti-inflammatory effects.

Research shows both anthocyanins and resveratrol can suppress inflammatory markers like tumor necrosis factor-alpha (TNF-alpha) and interleukin-6 (IL-6).

However, direct studies on whole-grape consumption are still limited.

May improve skin and hair health

Resveratrol may provide protective benefits for skin and hair.

This compound is popular in skincare because it can penetrate the skin barrier, boost collagen levels, and protect against UV-induced damage.

Animal research suggests resveratrol’s impact on collagen could speed wound healing.

Given that oxidative stress and inflammation can contribute to hair loss, studies in mice indicate resveratrol may encourage hair growth by protecting follicles and stimulating follicular cell activity.

Still, human trials exploring grape consumption’s direct effects on skin and hair are sparse.

May have anti-obesity effects

Obesity raises the risk of various conditions, including diabetes, heart disease, and some cancers.

Anthocyanins in grapes may exert anti-obesity actions. Rat studies suggest anthocyanins can limit weight gain and reduce liver fat in high-fat diet models.

Additionally, animal research found grape seed proanthocyanidin extract might raise levels of the fullness hormone GLP-1, potentially lowering appetite and food intake.

Human evidence is still lacking.

May relieve constipation

Constipation is characterized by infrequent bowel movements and a sense of incomplete evacuation.

Treatment typically involves dietary changes such as increasing fiber and fluids, since dehydration commonly contributes to constipation.

Fiber in whole fruits like grapes can meaningfully ease constipation by speeding up colonic transit, increasing fecal bulk, and promoting regular bowel movements compared with juices.

Grapes are also about 81% water, which helps with hydration goals.

May support sleep

Research suggests diet can directly affect sleep quality.

Grapes are a natural source of melatonin, the hormone that helps regulate the sleep-wake cycle.

Melatonin is concentrated mainly in grape skins, which is why products like grape juice and wine contain it.

Because melatonin interacts with your internal clock, timing matters. If you’re eating grapes to aid sleep, try consuming them in the early evening.

Simple ways to add grapes to your diet

Grapes are tasty, adaptable, and easy to include in a balanced diet. Try these ideas:

• Enjoy grapes on their own as a morning or afternoon snack.
• Blend them with spinach, cucumber, banana, kale, and mint for a nutrient-dense smoothie.
• Top yogurt with grapes, crushed nuts, and a drizzle of honey.
• Eat frozen grapes as a cooling summer snack.
• Toss chopped grapes into your favorite salad.
• Combine sliced apples, strawberries, and dark chocolate for a sweet yet healthy dessert.
• Drink 100% grape juice occasionally.
• Consume red wine in moderation.

For additional information about related fruits, see black grapes benefits and 10 benefits of grapefruit.

Fresh grapes vs. grape juice

Both grapes and grape juice offer health benefits, but whole grapes are typically the healthier option.

During juice production, heating to prevent fermentation can reduce antioxidant content by up to 44%.

Fruit juices also lack the fiber of whole fruits and tend to have higher sugar concentrations.

Diets emphasizing whole fruits over juices are more effective for managing weight because they:

• produce a slower blood sugar rise, avoiding spikes and crashes
• delay gastric emptying, boosting satiety and reducing calorie intake

Moreover, evidence indicates around 90% of adult women and 97% of adult men don’t meet recommended fiber intakes, which are 25 grams daily for women and 38 grams daily for men. Choosing whole grapes over juice helps increase fiber intake.

Does wine offer health benefits?

Like grapes and grape juice, wine contains antioxidants and may provide some similar health effects.

Research suggests moderate wine consumption may protect against heart disease, diabetes, and certain cancers.

However, heavy drinking (more than four drinks per day) is linked to an increased risk of mortality and heart problems.

Current U.S. dietary guidance advises limiting alcohol to 1 drink per day for women and 2 drinks per day for men (one drink = 5 ounces/150 mL of wine), and notes that drinking less or not at all is better for health.

Even so, like grape juice, wine does not contain the fiber found in whole grapes.

The bottom line

Grapes offer valuable nutrients and potent plant compounds that support health. Although they contain natural sugars, when eaten in moderation they don’t seem to harm blood sugar control.

Antioxidants such as resveratrol provide many of grapes’ advantages, including anti-inflammatory, anti-diabetic, and anti-cancer effects.

They’re tasty and easy to add to meals; for maximum benefit, choose fresh grapes over juice or wine.

Just one thing

Tip for today: To keep grapes fresh for up to 14 days, pick clusters with a green stem and store them in an airtight container at the back of your refrigerator, which tends to be the coldest spot.