A group of scientists recently took up the challenge to explore the properties of olive leaf infusions.
Oleuropein. The key to olive leaf tea’s purported benefits lies in an antioxidant called oleuropein. This compound is the primary phenolic component found in green olives and contributes to the bitter taste of extra virgin olive oils. Notably, oleuropein is also a significant component of olive leaves.
A study conducted in 2011 suggested that oleuropein could exhibit anti-fibrotic and anti-inflammatory effects. Interestingly, the concentration of oleuropein varies with the color of the leaf. Greener leaves contain higher levels, meaning those harvested in spring have more oleuropein compared to those collected at other times of the year.
Recent studies. The antioxidant properties of olive leaf tea have led many to consume the leaves as an infusion. However, are they truly safe and healthy?
A 2022 study combined data from 12 experimental studies involving 819 participants. It concluded that olive leaf extract improved risk factors for heart disease and lowered blood pressure. The extract was administered in capsule form at doses ranging from 500 milligrams to 5 grams over periods of six to 48 weeks. The results were particularly significant for individuals with high blood pressure.
A more recent study re-evaluated data from other studies involving 703 participants. In this case, the doses were much lower, ranging from 250 to 1,000 mg, administered either in capsules or incorporated into bread.
Some participants had high blood pressure and were overweight, while others were within normal health parameters. Researchers observed improvements in blood glucose control and a reduction in blood pressure. However, a thorough analysis of the data revealed no significant overall effects. This indicates that further research is necessary to fully understand the benefits of olive leaf infusions.
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Safe levels. Olive leaves could enhance the hypotensive effect, although further research is needed. However, studies generally agree that daily supplementation of oil leaf extract at doses of 1 gram per day has no adverse effects or contraindications.
Other studies recommend that women avoid olive leaf consumption when pregnant or breastfeeding, given that the efficacy and safety of olive leaf during pregnancy and lactation haven’t been proven.
Toxicity. Interestingly, there have been reports of aggressive behavior following excessive consumption of olive leaf extract. Experts suspect that a high dose (39 mg per pound of body weight) can be toxic, potentially causing a dopamine-like excess that leads to aggressive behavior.
A 67-year-old woman consumed 5.5 grams of dried olive leaf per day to treat hay fever. She experienced mood changes and aggressive behavior afterward. Researchers believe hydroxytyrosol, a component of olive leaf extract with a structure similar to dopamine, may alter dopamine levels. While this is still an isolated case, it serves as a cautionary example of self-medication.
Caution. Selling olive leaves for infusions isn’t inherently negative. Their antioxidant effects are beneficial. However, it’s crucial to apply common sense and avoid self-medicating with either chemical drugs or natural remedies.
Olive leaves can be healthy in small doses, but shouldn’t replace medications and treatments professionals prescribe. If you wish to use olive leaves as a supplement, you can take them in an infusion or incorporate them into smoothies, salads, and breads.
Image | Nazar Hrabovyi
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