Is matcha healthier than regular green tea?
Matcha probably delivers more active compounds than regular green tea, but whether that translates into measurable health benefits in practice depends strongly on the product you buy and what you are using it for.
Matcha contains higher concentrations of active compounds than regular green tea, mainly because with matcha you drink the entire leaf ground into a powder rather than a brewed liquid. This delivers more of the key antioxidant than any other type of tea. On top of that, matcha plants are grown in the shade before harvest, which causes the plant to produce extra theanine (a calming natural substance) and chlorophyll.
In laboratory measurements, matcha scores highly for antioxidant activity thanks to its high concentration of polyphenols. How strongly this translates inside the human body is less well understood and requires more studies in people.
On the topic of brain function and mood, the findings are mixed. A small study in 39 people showed that matcha can reduce anxiety, but only in products containing sufficient theanine and a favourable balance relative to caffeine. Not all matcha products meet this standard, because caffeine and theanine partly work against each other. For thinking and memory, a study in 61 older women found improvement with daily intake of 3 g of matcha powder over 12 weeks, but only in women, not in men. A longer study lasting 12 months in 99 older adults with mild memory complaints found no effect on the main measure of cognitive functioning; that study was partly funded by a tea company.
For blood sugar, blood fats, and gut health, there are signals from animal studies and laboratory work, but well-designed studies in people are largely lacking.
An important caveat about matcha in general: the amount of active compounds varies considerably from product to product. Climate, tea plant variety, leaf maturity, the milling process, and brewing temperature all play a role. Cheap or non-traditionally grown matcha may contain substantially fewer active compounds than the products used in research.
This answer draws on combined reviews of existing studies and a handful of small studies in people. The studies on stress reduction and cognition each had fewer than 100 participants, which calls for caution when drawing conclusions. Direct head-to-head studies in people comparing matcha with regular green tea are absent; the claim that matcha contains more active compounds is based primarily on chemical analyses and combined reviews of existing studies, not on direct comparisons in people. For effects on metabolism and gut health, evidence in people is still very limited.
How many cups of green tea do you need per day?
Two to three cups of green tea per day is the amount at which research shows the most health benefits, though cause and effect has not been proven. Let the tea cool a little before drinking; tea that is too hot increases the risk of oesophageal cancer.
Is coffee healthy or unhealthy?
For most healthy adults, three to four cups of filter coffee per day, without sugar and cream, does more good than harm. Pregnant women are a clear exception: limit intake and discuss it with your doctor.
Is eating organic food really healthier?
Eating organic probably does not give you better nutritional value, but it does lower your exposure to pesticide residues and to antibiotic-resistant bacteria via meat. For pregnant women and young children, that is the most concrete and well-supported argument.
Are smoothies and fresh juice just as healthy as whole fruit?
Whole fruit comes out ahead of fruit juice: more fibre, greater satiety, and fewer free sugars. Smoothies fall somewhere in between, but are not equivalent to whole fruit either.
Is soy healthy, or not because of the phytoestrogens?
Soy is probably harmless and possibly beneficial for most healthy adults, but caution is advised for children with thyroid problems. Anyone who eats a lot of soy and has doubts is best off discussing this briefly with a doctor or dietitian.
Is eating 800 grams of fruit and vegetables a day healthier than the standard guideline?
More than 400 grams a day helps, but whether 800 grams is clearly healthier than 400 grams depends on your goal: for heart and blood vessel disease there are indications that the benefit continues up to 800 grams, while for lifespan and cancer risk the advantage above five portions is less convincingly shown.