Consuming liquorice can significantly raise blood pressure due to glycyrrhizin, a compound that affects hormone balance and sodium retention.
Understanding the Connection Between Liquorice and Blood Pressure
Liquorice, a sweet root extract often used in candies, teas, and herbal remedies, carries more than just a unique flavor. Its impact on blood pressure has been a subject of scientific study and medical concern for decades. The key player here is glycyrrhizin, a natural compound found in liquorice root. This substance can cause the body to retain sodium and lose potassium, which disrupts the delicate balance of electrolytes necessary for healthy blood pressure regulation.
When glycyrrhizin enters the bloodstream, it inhibits an enzyme called 11-beta-hydroxysteroid dehydrogenase type 2 (11β-HSD2). This enzyme normally protects the kidneys from excess cortisol by converting it to an inactive form. Without this protection, cortisol starts acting like aldosterone—a hormone that tells kidneys to hold onto sodium and water. This retention increases blood volume and raises blood pressure. In some cases, this effect can lead to hypertension severe enough to require medical intervention.
How Much Liquorice Causes Blood Pressure Changes?
Not everyone who enjoys liquorice will experience a spike in blood pressure. The amount of glycyrrhizin consumed plays a crucial role. Research shows that eating more than 100 milligrams of glycyrrhizin daily—roughly equivalent to 50 grams (about 1.7 ounces) of liquorice candy—can cause measurable increases in blood pressure. However, sensitivity varies widely among individuals.
Some people may experience elevated blood pressure with even lower doses if they consume liquorice regularly over weeks or months. Others might tolerate larger quantities without noticeable changes. Factors like age, existing health conditions, kidney function, and concurrent medications also influence how liquorice affects blood pressure.
The Science Behind Glycyrrhizin’s Effect on Blood Pressure
Glycyrrhizin’s chemical structure allows it to interfere with steroid metabolism in the body. By blocking 11β-HSD2 enzymes in the kidney’s tubular cells, cortisol is allowed to bind mineralocorticoid receptors unchecked. This mimics excessive aldosterone activity—a condition medically called pseudohyperaldosteronism.
The consequences include:
- Sodium Retention: The kidneys hold onto sodium ions instead of excreting them.
- Potassium Loss: Potassium is excreted excessively, leading to low potassium levels (hypokalemia).
- Water Retention: Increased sodium causes water retention, raising blood volume.
- Elevated Blood Pressure: The combined effects increase vascular resistance and cardiac output.
These changes can cause symptoms such as headaches, swelling (edema), muscle weakness due to potassium loss, and even irregular heart rhythms in severe cases.
Clinical Studies Confirming Liquorice’s Impact
Numerous clinical trials have confirmed that daily ingestion of glycyrrhizin-rich liquorice leads to increased systolic and diastolic blood pressure readings within days or weeks. One landmark study showed that healthy volunteers consuming 100 grams of liquorice daily experienced an average rise in systolic blood pressure by about 10 mmHg after two weeks.
Another study found that hypertensive patients who consumed liquorice had worsened control over their condition despite medication. These findings have led health authorities worldwide to recommend caution regarding liquorice intake for people at risk of hypertension or cardiovascular disease.
Who Is Most at Risk From Liquorice-Induced Hypertension?
Not everyone reacts equally to liquorice consumption. Certain groups are more vulnerable:
- People with Pre-existing Hypertension: Liquorice can exacerbate high blood pressure already present.
- Elderly Individuals: Age-related kidney function decline makes them less able to handle electrolyte imbalances.
- Pregnant Women: Hormonal changes increase sensitivity; elevated blood pressure during pregnancy is dangerous.
- Individuals on Diuretics or Corticosteroids: These medications interact with electrolyte balance and can worsen effects.
- People With Kidney Disease: Impaired renal function reduces clearance of excess sodium and fluid.
If you fall into any of these categories, it’s wise to monitor your liquorice intake closely or avoid it altogether.
The Role of Potassium in Counteracting Effects
Potassium plays a vital role in maintaining normal blood pressure by balancing sodium levels inside cells and helping muscles—including the heart—function properly. Since glycyrrhizin causes potassium loss through urine, low potassium levels worsen hypertension symptoms.
Eating potassium-rich foods like bananas, spinach, oranges, and potatoes may help mitigate some effects of liquorice-induced hypertension but won’t fully counteract excessive consumption of glycyrrhizin-containing products.
Differentiating Natural Liquorice from Licorice-Flavored Products
It’s important not to confuse natural liquorice root products with licorice-flavored candies or gums that often contain little or no actual liquorice extract but instead use anise oil or artificial flavorings for taste.
Natural liquorice products contain significant amounts of glycyrrhizin—the culprit behind raised blood pressure—while many commercial “licorice” candies may not pose the same risk due to low or absent glycyrrhizin content.
Always check ingredient labels carefully if you want to avoid raising your blood pressure inadvertently through candy consumption.
Nutritional Comparison Table: Glycyrrhizin Content vs Blood Pressure Impact
| Product Type | Approximate Glycyrrhizin Content (mg/100g) | Potential Blood Pressure Effect |
|---|---|---|
| Natural Liquorice Root Extract | 4000 – 8000 mg | High risk; significant BP increase possible with moderate intake |
| Candy Made With Real Liquorice Extract | 200 – 1000 mg | Moderate risk; BP elevation likely with large quantities over time |
| Anise-Flavored Licorice Candy (No Real Extract) | <10 mg (trace) | No significant effect on BP expected |
| Pills/Supplements Containing Glycyrrhizin | Varies widely (up to several thousand mg) | Potentially very high risk; monitor dosage strictly |
| DGL (Deglycyrrhizinated Liquorice) Products | <5 mg (minimal) | No effect on BP; safe alternative for most users |
The Dangers of Long-Term Excessive Liquorice Consumption on Heart Health
Chronic intake of high doses of glycyrrhizin doesn’t just raise blood pressure temporarily—it poses serious risks over time. Persistent hypertension strains arteries and the heart muscle itself, increasing risks for:
- Atherosclerosis: Hardening and narrowing of arteries due to constant high-pressure stress.
- Heart Failure: The heart weakens trying to pump against elevated resistance.
- Atrial Fibrillation: Electrolyte imbalances from low potassium can trigger irregular heartbeats.
- Cerebrovascular Events: Stroke risk rises when high BP damages brain vessels.
- Kidney Damage: High BP accelerates renal decline leading potentially to chronic kidney disease.
Many documented cases link excessive liquorice consumption with severe hypertension requiring hospitalization or even intensive care treatment.
Treatment Options If You Experience Liquorice-Induced Hypertension
If you suspect your elevated blood pressure stems from eating too much liquorice—or if diagnosed by your doctor—several steps help reverse the condition:
- Avoid All Sources Of Glycyrrhizin: Stop consuming natural liquorice products immediately.
- K+ Supplementation:If hypokalemia is present, doctors may prescribe potassium supplements or recommend dietary adjustments.
- Meds To Control Blood Pressure:If BP remains high despite stopping liquorice intake, antihypertensive drugs might be necessary temporarily.
- Lifestyle Changes:A balanced diet low in sodium plus regular exercise supports recovery.
Symptoms usually improve within days after stopping glycyrrhizin intake but full normalization might take weeks depending on severity.
The Safe Use of Deglycyrrhizinated Liquorice (DGL)
For those who enjoy the taste or therapeutic benefits of liquorice but worry about raising their blood pressure, deglycyrrhizinated liquorice (DGL) offers a safer alternative. DGL has had most glycyrrhizin removed through processing while retaining flavor compounds beneficial for digestive health such as soothing ulcers or inflammation.
Because DGL contains negligible amounts of glycyrrhizin (<5 mg per serving), it does not cause sodium retention or elevate blood pressure like natural liquorice does. Many herbalists recommend DGL supplements for people seeking relief from stomach discomfort without risking cardiovascular side effects.
Caution: Supplements Aren’t Always Regulated Strictly!
While DGL supplements reduce risks related to hypertension caused by natural liquorice extracts, consumers must be cautious when purchasing any herbal product. Some supplements labeled “licorice” may still contain varying amounts of glycyrrhizin unless clearly specified as deglycyrrhizinated.
Always buy from reputable brands with third-party testing certificates if possible—and consult healthcare providers before starting new supplements if you have pre-existing conditions such as high blood pressure or kidney problems.
Key Takeaways: Does Liquorice Raise Blood Pressure?
➤ Liquorice contains glycyrrhizin, which can affect blood pressure.
➤ Excessive consumption may lead to elevated blood pressure levels.
➤ Moderate intake is generally safe for most individuals.
➤ People with hypertension should limit liquorice consumption.
➤ Consult a doctor if unsure about liquorice and your health.
Frequently Asked Questions
Does liquorice raise blood pressure in everyone?
Not everyone who consumes liquorice will experience raised blood pressure. The effect depends on the amount of glycyrrhizin consumed and individual sensitivity. Some people may see increases with smaller amounts, while others tolerate larger quantities without noticeable changes.
How does liquorice raise blood pressure?
Liquorice raises blood pressure by the compound glycyrrhizin, which disrupts hormone balance. It causes sodium retention and potassium loss by inhibiting an enzyme that normally protects the kidneys, leading to increased blood volume and elevated blood pressure.
How much liquorice causes blood pressure changes?
Research suggests consuming more than 100 milligrams of glycyrrhizin daily—about 50 grams of liquorice candy—can raise blood pressure. However, sensitivity varies, and regular intake over time may cause changes even at lower doses.
Can liquorice-induced high blood pressure be dangerous?
Yes, liquorice-induced hypertension can be severe enough to require medical intervention in some cases. Prolonged high blood pressure increases risks for heart disease and stroke, so monitoring intake is important for those at risk.
Are certain people more affected by liquorice raising blood pressure?
Individuals with existing health conditions, older adults, or those with impaired kidney function are more susceptible to liquorice’s effects on blood pressure. Medications and overall health also influence how much liquorice impacts an individual’s blood pressure.
The Bottom Line – Does Liquorice Raise Blood Pressure?
Yes—natural liquorice containing glycyrrhizin can significantly raise blood pressure by disrupting hormonal control over sodium retention and potassium loss in the kidneys. The extent depends on how much is consumed regularly and individual susceptibility factors like age and existing health issues.
Avoiding large amounts of real liquorice products is crucial for anyone concerned about hypertension or heart health risks linked with elevated blood pressure levels caused by this sweet root extract.
Switching to deglycyrrhizinated versions provides a safer way to enjoy its flavor without compromising cardiovascular wellness. If you notice symptoms like headaches, swelling, muscle cramps after eating liquorice regularly—get your blood pressure checked promptly!
Understanding these facts empowers you to make informed choices about including—or excluding—this ancient treat from your diet while keeping your heart happy and healthy.