A new exploration of tea's health benefits reveals that the humble brew, derived from the Camellia Sinensis plant, is packed with over 200 bioactive components. Among these, polyphenol compounds offer antioxidant properties and promote healthier bones. A decade-long study of over a thousand older women found that those who drank three or more cups daily were 30% less likely to suffer from osteoporosis-related fractures compared to those who drank one cup or less per week.
The amino acid L-theanine, found in tea, increases levels of the neurotransmitter GABA, which reduces the brain's stress response. Professor Andrew Steptoe of University College London conducted a double-blind placebo-controlled trial showing that tea drinkers experienced a more rapid recovery from stress, with lower blood pressure and cortisol levels after a challenging task. He attributes this to the rise in GABA levels.
L-theanine also works with caffeine to boost brain function. Brain scans indicate that this combination increases alpha brainwave activity, associated with calm alertness, creativity, and improved memory and reaction time. An 11-year study of half a million people in the UK found that those who drank two or more cups daily had a significantly lower risk of dying, with reduced risks of stroke and heart disease.
Professor Steptoe's research further suggests that tea reduces inflammation and platelet activation, both factors in heart disease. Participants who drank tea for six weeks showed lower levels of these markers compared to those on a placebo. Adding sugar or milk does not negate these benefits, but steeping the tea long enough is crucial to activate its bioactive elements.
On the BBC Radio 4 podcast 'Just One Thing', Michael Mosley encouraged prop-maker Kit to swap her morning coffee and afternoon fizzy drink for two cups of tea daily. After a week, she reported feeling calmer and less jittery, noting that tea provided a gentler buzz than coffee. She plans to make the change permanent, highlighting tea's potential as a healthier alternative for focus and relaxation.
