Black Licorice Heart Risks: What Adults Over 40 Should Know

Black licorice, a candy loved for its unique sweet-tart flavor, poses serious risks to heart health due to its key ingredient, glycyrrhizin. This compound from licorice root can disrupt potassium levels, leading to irregular heartbeats, elevated blood pressure, and even life-threatening complications, particularly in adults over 40.

What Makes Black Licorice Dangerous?

The danger stems from

glycyrrhizin

, a natural sweetener in real black licorice that’s 50 times sweeter than sugar. Unlike anise-flavored imitations, true black licorice retains this compound, which inhibits an enzyme called 11β-HSD2. This action causes the kidneys to retain sodium and excrete potassium, resulting in

hypokalemia

(low potassium) and potential

hypernatremia

(high sodium).

Low potassium disrupts electrical signals in the heart, prolonging the QT interval and triggering

arrhythmias

like ventricular tachycardia. Meta-analyses confirm licorice intake raises systolic blood pressure by 5.45 mmHg and diastolic by 3.19 mmHg on average.

• **Sodium retention**: Leads to fluid buildup, swelling (edema), and higher blood pressure.
• **Potassium drop**: Critical for heart muscle function; severe cases cause muscle weakness and lethargy.
• **Vascular effects**: Increases arterial stiffness and systemic resistance, worsening cardiovascular strain.

Who Is Most at Risk?

While anyone can be affected, certain groups face heightened dangers:

• Adults

  over 40

  : FDA warns this demographic is most vulnerable to arrhythmias from daily consumption.
• People with

  pre-existing heart disease

  , high blood pressure, or hypertension history.
• Those on medications like diuretics, ACE inhibitors, or digoxin, as licorice exacerbates interactions.
• Individuals with kidney issues or low baseline potassium levels.

Studies show even healthy people experience blood pressure spikes from 290–370 mg glycyrrhizin daily (about 50g licorice) after two weeks.

Real-Life Dangers: Case Studies and Fatalities

Black licorice has caused documented harm, including death. In 2020, a 54-year-old man died from cardiac arrest after eating a bag-and-a-half of black licorice daily for weeks. His potassium plummeted due to glycyrrhizin, leading to fatal arrhythmia despite no prior conditions.

Other cases include:

• A 10-year-old boy developing high blood pressure and seizures from excessive intake.
• Adults experiencing pulmonary edema, congestive heart failure, and QT prolongation.
• Transient issues like migraines, visual loss, and encephalopathy from severe hypokalemia.

Emergency responders struggled to resuscitate the 54-year-old due to refractory arrhythmia, highlighting how low potassium complicates defibrillation.

How Much Black Licorice Is Too Much?

The FDA sets clear limits: For those over 40,

no more than 2 ounces (57g) per day

, and avoid for two weeks straight. Younger people tolerate more, but excess remains risky.

Group	Daily Limit	Duration Warning	Risks if Exceeded
Under 40, healthy	Moderate (e.g., 1-2 oz)	Occasional	Mild BP rise, fatigue
Over 40	<2 oz	<2 weeks	Arrhythmia, hospitalization
Heart patients	Avoid	N/A	Heart failure, death

Dose-response data: 75 mg glycyrrhizin (~50g licorice) daily raises systolic BP significantly in two weeks.

Not All ‘Licorice’ Is the Same

Many products labeled ‘licorice’ use

anise oil

for flavor, lacking glycyrrhizin and thus safe. Check labels: Real black licorice lists licorice root or glycyrrhizin. Red licorice and twists are typically anise-based.

• True black licorice: From Glycyrrhiza glabra root; risky.
• Anise-flavored: Safe alternative; no heart risks.

Health Benefits of Licorice Root (With Caveats)

Licorice root offers benefits in moderation:

• Soothes digestive issues, sore throats, and menopausal symptoms.
• Antioxidant glabridin may inhibit LDL oxidation and support glucose metabolism.
• Potential cardioprotection in rats via reduced oxidative stress.

However, supplements amplify risks; consult doctors, especially with heart meds.

Symptoms to Watch For

Stop eating immediately if you notice:

• Irregular heartbeat or palpitations.
• Swelling in legs/ankles (edema).
• Muscle weakness, fatigue, or lethargy.
• High blood pressure spikes.
• Nausea, headaches, or vision changes.

Seek medical help for severe symptoms; blood tests confirm low potassium.

Safe Alternatives and Tips

Enjoy candy safely:

• Opt for anise or red licorice.
• Limit true black licorice to occasional treats.
• Boost potassium with bananas, spinach, yogurt.
• Monitor BP if at risk; talk to your doctor.

Pregnant people and heart patients should avoid it entirely.

Frequently Asked Questions (FAQs)

Is all black licorice dangerous?

No, only true black licorice with glycyrrhizin. Anise-flavored versions are safe.

Can kids eat black licorice?

In small amounts, yes, but monitor for issues. FDA focuses warnings on over-40s.

How quickly do effects start?

BP rises in 1-2 weeks; severe hypokalemia faster with excess.

Does cooking with licorice root pose risks?

Yes, if containing glycyrrhizin; use deglycyrrhizinated (DGL) forms for safety.

What if I ate too much— what now?

Stop intake, eat potassium-rich foods, see a doctor for tests.