Foeniculum vulgare, commonly known as fennel, is a flavorful culinary herb and medicinal plant.
Fennel plants are green and white, with feathery leaves and yellow flowers.
Both the crunchy bulb and the seeds of the fennel plant have a mild, licorice-like flavor. Yet, the flavor of the seeds is more potent due to their powerful essential oils.
Aside from its many culinary uses, fennel and its seeds offer a wide array of health benefits and may provide antioxidant, anti-inflammatory, and antibacterial effects.
Here are 10 benefits of fennel and fennel seeds, all based on science.
1. Highly nutritious
Both fennel and its seeds are packed with nutrients. Here’s the nutrition for 1 cup (87 grams) of raw fennel bulb and 1 tablespoon (6 grams) of dried fennel seeds (1Trusted Source):
|Fresh fennel bulb||Dried fennel seeds|
|Fiber||3 grams||2 grams|
|Vitamin C||12% of the RDI||1% of the RDI|
|Calcium||3% of the RDI||5% of the RDI|
|Iron||4% of the RDI||6% of the RDI|
|Magnesium||4% of the RDI||5% of the RDI|
|Potassium||8% of the RDI||2% of the RDI|
|Manganese||7% of the RDI||17% of the RDI|
Fresh fennel bulb is a good source of vitamin C, a water-soluble vitamin critical for immune health, tissue repair, and collagen synthesis (2Trusted Source). Health Benefits of Fennel Seeds
Vitamin C also acts as a potent antioxidant in your body, protecting against cellular damage caused by unstable molecules called free radicals (3Trusted Source).
Both the bulb and seeds contain the mineral manganese, which is important for enzyme activation, metabolism, cellular protection, bone development, blood sugar regulation, and wound healing (4Trusted Source).
Aside from manganese, fennel and its seeds contain other minerals vital to bone health, including potassium, magnesium, and calcium (5Trusted Source).
SUMMARY: Fennel and fennel seeds provide important nutrients, such as vitamin C, calcium, magnesium, potassium, and manganese.
2. Contain powerful plant compounds
Perhaps the most impressive benefits of fennel and fennel seeds come from the antioxidants and potent plant compounds they contain.
Essential oil of the plant has been shown to contain more than 87 volatile compounds, including the polyphenol antioxidants rosmarinic acid, chlorogenic acid, quercetin, and apigenin (6Trusted Source). Health Benefits of Fennel Seeds
Polyphenol antioxidants are potent anti-inflammatory agents that have powerful effects on your health.
Studies suggest that people who follow diets rich in these antioxidants have a lower risk of chronic conditions like heart disease, obesity, cancer, neurological diseases, and type 2 diabetes (7Trusted Source).
What’s more, over 28 compounds have been identified in fennel seeds, including anethole, fenchone, methyl chavicol, and limonene.
Animal and test-tube studies note that the organic compoundanethole has anticancer, antimicrobial, antiviral, and anti-inflammatory properties (8Trusted Source).
Finally, the plant compound limonene helps combat free radicals and has been shown to protect rat cells from damage caused by certain chronic diseases (9Trusted Source, 10Trusted Source). Health Benefits of Fennel Seeds
SUMMARY: All parts of the fennel plant are rich in powerful antioxidants like chlorogenic acid, limonene, and quercetin — all of which may benefit health.
3. Fennel seeds may suppress appetite
Fennel seeds may not only add depth and flavor to your recipes but also help curb appetite.
A study in 9 healthy women demonstrated that those who drank 8.5 ounces (250 ml) of tea made with 2 grams of fennel seeds before eating lunch felt significantly less hungry and consumed fewer calories during the meal than those who drank a placebo tea (11Trusted Source).
Anethole, a major component of fennel essential oil, may be behind the appetite-suppressing qualities of the plant.
That said, another study in 47 women found that those who supplemented with 300 mg of fennel extract daily for 12 weeks gained a small amount of weight, compared to a placebo group. They also did not experience reduced appetite (12Trusted Source).
Research in this area is conflicting, and more studies are needed to fully understand the potential appetite-suppressing properties of fennel.
SUMMARY: Fennel seeds may reduce appetite, yet current study results are conflicting. Thus, more research is needed.
4. Can benefit heart health
Eating fennel and its seeds may benefit heart health in a number of ways, as they’re packed with fiber — a nutrient shown to reduce certain heart disease risk factors like high cholesterol. Health Benefits of Fennel Seeds
A 1-cup (87-grams) serving of raw fennel bulb packs 3 grams of fiber — 11% of the Daily Reference Value (DRV).
Diets high in fiber have been linked to a reduced risk of heart disease. A review of 22 studies associated a greater dietary fiber intake with a lower risk of heart disease. For every additional 7 grams of fiber consumed per day, heart disease risk decreased by 9% (13Trusted Source).
Fennel and its seeds also contain nutrients like magnesium, potassium, and calcium, which play important roles in keeping your heart healthy (14Trusted Source). Health Benefits of Fennel Seeds
For example, including rich sources of potassium in your diet may help reduce high blood pressure, a risk factor for heart disease (15Trusted Source).
SUMMARY: Fennel and its seeds contain fiber, potassium, magnesium, and calcium — all of which are essential for good heart health.
5. May have cancer-fighting properties
The wide array of powerful plant compounds in fennel may help protect against chronic diseases, including certain cancers.
For example, anethole — one of the main active compounds in fennel seeds — has been found to exhibit cancer-fighting properties.
One test-tube study showed that anethole suppressed cell growth and induced apoptosis, or programmed cell death, in human breast cancer cells (16Trusted Source). Health Benefits of Fennel Seeds
Another test-tube study observed that fennel extract stopped the spread of human breast cancer cells and induced cancer cell death (17Trusted Source).
Animal studies also suggest that extract from the seeds may protect against breast and liver cancer (18Trusted Source).
Although these results are promising, human studies are needed before fennel or its extract can be recommended as an alternative treatment for cancer. Health Benefits of Fennel Seeds
SUMMARY: Test-tube and animal studies have shown that fennel may have anticancer properties. However, it’s uncertain whether the same effects would be seen in humans.
6. May benefit breastfeeding women
Fennel has been shown to have galactogenic properties, meaning it helps increase milk secretion. Research suggests that specific substances found in anethole, such as dianethole and photoanethole, are responsible for the galactogenic effects of the plant (6Trusted Source).
However, other studies found no effect on milk secretion or infant weight gain. Negative side effects, such as poor weight gain and difficulty feeding, have also been reported in infants whose mothers drank lactation teas containing fennel (21Trusted Source, 22Trusted Source, 23Trusted Source).
For these reasons, breastfeeding women should consult their healthcare provider before using fennel to stimulate milk production.
SUMMARY: Some studies suggest that fennel may increase milk secretion and weight gain in breastfeeding infants, yet other studies have shown no benefit.
7–10. Other potential benefits
Aside from the benefits mentioned above, fennel and its seeds may improve your health in the following ways:
- May have antibacterial properties. Studies show that fennel extract inhibits the growth of potentially harmful bacteria and yeasts, such as Escherichia coli, Staphylococcus aureus, and Candida albicans (24Trusted Source).
- May reduce inflammation. The powerful antioxidants in fennel, such as vitamin C and quercetin, can help reduce inflammation and levels of inflammatory markers (25Trusted Source).
- May benefit mental health. Animal studies have found that fennel extract may reduce aging-related memory deficits (26Trusted Source).
- May relieve menopausal symptoms. A review of 10 studies noted that fennel may improve sexual function and satisfaction in menopausal women, as well as relieve hot flashes, vaginal itching, dryness, pain during sex, and sleep disturbances (27Trusted Source).
It’s important to note that many of these studies used concentrated doses of the plant, and it’s unlikely that eating small amounts of fennel or its seeds would offer the same benefits. Health Benefits of Fennel Seeds
SUMMARY: Fennel has antibacterial properties and may improve mental health, relieve menopausal symptoms, and reduce inflammation. Still, it’s unlikely that fennel or its seeds would offer the same effects when eaten in small amounts.
Though fennel and its seeds are likely safe when eaten in moderation, there are some safety concerns over more concentrated sources of fennel, such as extracts and supplements.
For example, fennel has strong estrogenic properties, meaning that it acts similarly to the hormone estrogen. While this may help relieve menopausal symptoms, it may be unsafe for pregnant women. Health Benefits of Fennel Seeds
Due to its estrogen-like activity, there is concern over the plant’s potential teratogenicity — the potential to disturb fetal growth and development.
A study that evaluated the teratogenicity of fennel essential oil showed that high doses may have toxic effects on fetal cells (28Trusted Source).
Although eating fennel and its seeds is likely safe, pregnant women should avoid taking supplements or ingesting the essential oil of this plant.
Fennel may also interact with certain medications, including estrogen pills and certain cancer medications, so always consult your healthcare provider before using high doses in supplement, essential oil, or extract form (29Trusted Source).
SUMMARY: Although eating fennel and its seeds is likely safe, consuming higher doses in supplement form may react with certain medications and is unsafe for pregnant women.
The bottom line
Both the flavorful, crunchy bulb and aromatic seeds of the fennel plant are highly nutritious and may offer an abundance of impressive health benefits.
Adding them to your diet may improve heart health, reduce inflammation, suppress appetite, and even provide anticancer effects.
To reap the benefits of fennel and its seeds, try incorporating raw fennel bulb into your salads or using the seeds to flavor soups, broths, baked goods, and fish dishes. Health Benefits of Fennel Seeds
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