Hay fever, a condition affecting millions, brings a range of debilitating symptoms, with constant sneezing being one of the most troublesome for sufferers. Now, groundbreaking research from Japan suggests that a specific hot beverage might help dial down this relentless symptom. A study indicates that matcha tea powder could significantly reduce the need to sneeze in individuals with nasal allergies, providing much-needed relief.
What is Matcha Tea?
Matcha is a vibrant green powder crafted from specially cultivated green tea leaves that are dried and finely ground. It is widely used for brewing tea and as a flavouring agent in various food products. Previous studies have highlighted its rich content of biologically active compounds, including potent antioxidants and amino acids. These components are linked to numerous health advantages, such as enhanced heart and brain function, as well as reduced inflammation throughout the body.
Research on Hay Fever and Matcha
Professor Osamu Kaminuma, from the Research Institute for Radiation Biology and Medicine at Hiroshima University in Japan, led the investigation into matcha's effects on allergic rhinitis, commonly known as hay fever. He noted, "Human studies suggest green tea may relieve allergic rhinitis, but how it works is unclear." Hay fever is an escalating issue in the UK, with prevalence tripling over the last two decades. It typically begins in childhood but can emerge at any age, affecting 10-15% of children and rising to 26% of adults, according to UK Health Security Agency figures.
Study Methodology and Findings
In an early access paper published on March 5 in npj Science of Food, Kaminuma and his team conducted experiments on mice engineered to exhibit hay fever symptoms. The mice were administered matcha tea two to three times weekly for over five weeks, with an additional dose given 30 minutes before exposure to an allergen designed to trigger allergic rhinitis symptoms.
The results were striking: the mice treated with matcha sneezed far less than anticipated. Interestingly, the matcha did not appear to influence key immune markers typically associated with allergic responses, such as immunoglobulin E (IgE), mast cells, and T cells. IgE antibodies bind to mast cells, initiating the release of histamine and other inflammatory chemicals, while T cells manage longer-term immune processes, including IgE production.
Mechanism of Action
Professor Kaminuma explained, "Oral matcha reduced sneezing without clearly changing major immune markers. Instead, it strongly suppressed brainstem neuronal activation linked to the sneezing reflex." The researchers examined the activity of the c-Fos gene, which indicates neurological and behavioural responses to intense stimuli like allergen exposure, in the ventral spinal trigeminal nucleus caudalis—a brain region involved in sneezing. They found that hay fever increased c-Fos gene expression, but matcha treatment nearly restored it to normal levels.
Future Directions and Implications
The next phase of research will focus on determining whether these effects translate to humans. Kaminuma emphasised, "The goal is an evidence-backed, food-based option that complements standard care for allergic rhinitis symptoms." This discovery could pave the way for natural, dietary interventions to alleviate hay fever, offering hope to the one in five people in the UK who grapple with this condition annually.
