Somewhere between the first sip and the second cup, something shifts. The chest loosens. The noise quiets. Chai has always been a ritual, a reset, a way to start again. And it turns out, there is actual science behind why it works.

The conversation around food and mental health has grown a lot in recent years. What South Asian families knew intuitively, researchers are now mapping with data. Chai sits right at the centre of that.

L-theanine, cortisol, and why tea actually calms us down

Black tea, the base of most South Asian chai recipes, contains L-theanine, an amino acid that promotes relaxed alertness without drowsiness. A 2007 study published in Psychopharmacology found that L-theanine reduced cortisol response during stress tasks in participants, and increased alpha brain wave activity, which is the state associated with calm focus.

It does not sedate. It settles. There is a real difference. And that distinction might explain why chai feels less like a stimulant and more like a steadying presence, even though it contains caffeine.

Research from University College London also found that people who drank black tea four times daily for six weeks had significantly lower cortisol levels and higher relaxation ratings after stress. The control group drank a placebo with matched caffeine. The tea group did measurably better.

The spices do more than flavour the cup

Traditional chai is not just tea. The spice blend, whether it is cardamom, cloves, ginger, cinnamon, or black pepper, adds a layer of bioactive compounds that researchers have started studying seriously. We have already written about what haldi does to the brain, but the other spices in the cup deserve attention too.

Cardamom contains antioxidants that may reduce inflammatory markers. A 2017 randomised trial found cardamom supplementation significantly lowered hs-CRP, a key inflammation marker, in pre-diabetic women. Chronic inflammation and depression are increasingly understood to be connected, which makes this more than a nutrition footnote.

Ginger has been studied for its effect on serotonin and dopamine pathways. Research from Phytotherapy Research suggests ginger extract shows antidepressant-like effects in animal models, likely through monoamine modulation. The human evidence is still building, but the biological plausibility is there.

The ritual matters as much as the ingredients

Ask any South Asian person about chai and the answer will not just be about flavour. It will be about sitting with someone. About the pause in the middle of a long day. About a cup someone made for them when things were hard.

That social dimension is not soft or secondary. Harvard research on adult development consistently finds that the quality of our relationships is one of the strongest predictors of long-term mental and physical health. A cup of chai shared with someone is, in a very real sense, a mental health intervention.

The ritual of making it matters too. Repetitive, sensory-rich activities, stirring, watching it simmer, waiting, can function as grounding practices. Occupational therapists and mindfulness researchers both point to the importance of embodied routine in regulating the nervous system.

Chai and South Asian identity

For many South Asians in Canada, chai carries something harder to measure: a sense of continuity. It connects the present to a particular kind of home, a smell, a sound, a texture of belonging. Research on cultural identity and mental health is clear that a secure cultural identity acts as a protective factor, especially for immigrant communities navigating between worlds.

This is part of why culturally attuned care matters so much. If we want to support South Asian mental health meaningfully, we can not treat culture as peripheral. It is central. Our approach at Sukoon is built on exactly that understanding.

What chai can not do

None of this is a prescription. Chai will not treat depression or anxiety on its own, and it is not meant to.

But it is a genuine example of what South Asian food cultures have long understood: that what we eat and how we gather around it is part of how we stay well. Alongside professional support, movement, sleep, and connection, the daily ritual of a good cup of chai is quietly doing something real.

If we’ve got you thinking about what else shapes mental health in South Asian communities, the blog on dahi, probiotics, and mood is a good next read.

And if chai breaks down into something harder, know that support is available.