I drank coffee for years, and I still like coffee. But there is something about the first ninety-five minutes that does not suit counting stitches.
Matcha does something else to me. And it turns out there is a reason for that.
What sets it apart from ordinary green tea
Ordinary tea is leaves you pour water over, and then throw away. Matcha is the whole leaf, ground to powder, and you drink it.
That means you get everything in the leaf — including an amino acid called L-theanine. It is in ordinary green tea as well, but a cup of matcha gives you more of it, simply because you are drinking the leaf instead of pouring it off.
What the research says about the combination
The interesting part is not the caffeine alone, and not the theanine alone. It is that they arrive together.
A systematic review in Nutrition Reviews pooled the trials on theanine and caffeine in combination. The conclusion was small to moderate improvements in attention compared with placebo, clearest in the second hour after intake, with effects on some measures of mood as well.
An older study from 2008 found the same pattern: better attention, less distractibility, and less of the tired feeling that follows afterwards.
Two honest caveats. The trials often use pure capsules at fixed doses rather than cups of tea — how much theanine is in your particular powder varies with cultivar and growing. And the effect sizes are small to moderate, not dramatic.
So: it is not imagination. But it is not a different person either.
For the knitting
I have mine in the late morning, when I am about to sit with something that needs counting.
In the studies the effect was clearest in the second hour. That matches my own experience: it is not a jolt the way coffee is, but something that settles quietly over a session.
And the foam on top is entirely unnecessary. I make it anyway.