Putting the kettle on is an everyday action most of us don’t think much about—it’s simply part of our routines.
However, there’s also a health element at play. A major new review has confirmed that regularly drinking tea, particularly green tea, can meaningfully reduce the risk of heart disease, diabetes, cancer, and cognitive decline, and may even help you live longer. The catch is that bottled tea and bubble tea often contain added sugar, artificial sweeteners, and preservatives that cancel out those benefits entirely, making the way you drink it just as important as whether you drink it at all.
Tea has a well-documented effect on heart health and overall survival.
The review found strong evidence that regular tea consumption reduces the risk of cardiovascular disease, which remains the leading cause of death globally. Green tea in particular appears to lower blood pressure and improve cholesterol levels, and multiple large-scale studies found that consistent tea drinkers had lower rates of death from all causes, not just heart-related ones. The compounds responsible are called catechins, a type of antioxidant polyphenol that reduces inflammation and oxidative stress, both of which drive chronic disease over time.
Green tea contains the highest concentration of catechins, which is why it tends to come out ahead in the research, but black, oolong, and white tea all contain polyphenols too. The evidence base for those varieties is less developed, but the researchers believe the benefits likely extend across tea types to varying degrees. What’s clear is that the plant itself, brewed simply and without additives, is where the value lies.
Regular tea drinkers appear to have a lower risk of several types of cancer.
The review found that regular tea drinkers showed reduced rates of certain cancers across multiple studies, with the evidence strongest for green tea and cancers of the digestive system. The anti-inflammatory and antimicrobial properties of tea’s active compounds appear to inhibit the kind of cell damage that leads to tumour development over time. The researchers were careful to note that tea isn’t a treatment for cancer and the findings are about risk reduction at a population level rather than guaranteed outcomes for individuals.
The way to think about it is that people who drink tea regularly as part of a balanced lifestyle show better health outcomes across multiple measures, and the compounds in tea appear to be a genuine contributing factor rather than a coincidence. More long-term human studies are still needed to build a fuller picture, particularly across different tea types, but the existing evidence is consistent enough to be meaningful.
There’s growing evidence that tea protects the ageing brain.
Studies in the review found that regular tea drinkers had a lower prevalence of cognitive decline and fewer biological markers associated with Alzheimer’s disease, particularly in older adults. The neuroprotective effects appear to work by reducing inflammation in the brain and protecting neurons from oxidative damage that accumulates over time. Drinking tea regularly from middle age onwards is where the protective effect appears most meaningful, and the consistency of findings across different studies gives researchers confidence the relationship is real.
This sits alongside a separate but related finding about muscle health. The catechins in tea may help slow age-related muscle loss, with studies suggesting regular tea drinkers show better physical performance and muscle strength in older age. Chronic low-level inflammation is one of the key drivers of muscle deterioration as we age, and tea’s anti-inflammatory properties appear to offer some protection against that process.
Weight management and diabetes risk are also on the list.
Studies involving overweight and obese individuals found that regular green tea consumption was associated with modest but real reductions in body weight and improvements in how the body processes fat and sugar. On diabetes specifically, the evidence suggests tea can improve insulin response and help regulate blood sugar levels, both central to reducing type 2 diabetes risk. These effects won’t replace other lifestyle changes but they contribute meaningfully to overall metabolic health.
The researchers are clear that the benefits are most consistently demonstrated with green tea, though they believe other varieties offer related advantages. What undermines all of it is processing. Bottled and bubble tea versions frequently contain so much added sugar and so few intact beneficial compounds that they have more in common with a soft drink than a health-supporting beverage.
Bottled and bubble tea are a different story entirely.
Bottled tea sold in supermarkets and convenience stores frequently contains high levels of added sugar, artificial sweeteners, and preservatives that either reduce the concentration of beneficial compounds or introduce ingredients with their own negative effects.
Bubble tea typically contains very high amounts of sugar and calorie-dense toppings, and while occasional consumption isn’t cause for alarm, treating it as equivalent to a freshly brewed cup would be a mistake based on what the evidence shows. Freshly brewed tea from loose leaves or a plain bag, without added sugar, is the version that delivers what the research describes.
There are also some lesser-known concerns worth knowing about for heavy tea drinkers. Pesticide residues, heavy metals, and microplastics have been detected in some commercial tea products, and while these don’t pose significant risks at typical consumption levels, they’re worth considering for anyone drinking very large amounts over many years.
The compounds in tea can also interfere with iron and calcium absorption, which matters most for vegetarians, vegans, or anyone at risk of deficiency. Spacing tea away from mealtimes is a simple adjustment that reduces this without needing to cut back on how much you drink.
