Neither tea nor coffee is categorically healthier. Both are linked to longer life, lower rates of heart disease, and reduced risk of type 2 diabetes, but they work through different compounds and suit different bodies. The better choice depends on how much you drink, how you brew it, and how your body handles caffeine. Here’s what the evidence actually shows across the areas that matter most.
Antioxidant Content Per Cup
Coffee delivers more antioxidants per serving than any type of tea. A standard cup of coffee contains roughly 200 mg of polyphenols per 100 mL, compared to 115 mg for green tea, 96 mg for black tea, and 39 mg for oolong. One serving of coffee supplies approximately 300 mg of total polyphenols. These are the plant compounds most often credited with the health benefits of both beverages.
The types of antioxidants differ, though. Coffee is rich in chlorogenic acids, a family of compounds that support blood sugar regulation and feed beneficial gut bacteria. Tea contains catechins, a class of flavonoids with strong anti-inflammatory properties. You don’t need to pick one category of antioxidant over the other. Both types reduce oxidative stress, and drinking both beverages appears to have additive benefits (more on that below).
Heart Health
This is where the picture gets more nuanced. Green tea shows strong, consistent links to lower cardiovascular risk. People who drink seven or more cups of green tea per day have shown a 62% lower risk of dying from stroke and a 53% lower risk of dying from a heart attack compared to non-drinkers, based on data published in the Journal of the American Heart Association.
Coffee also protects the heart, but with an important caveat around blood pressure. In people whose blood pressure is below the threshold for severe hypertension, drinking one or more cups of coffee per day is associated with a 43% lower risk of dying from coronary heart disease. For people with severely elevated blood pressure, however, the relationship flips. Drinking two or more cups of coffee daily was associated with roughly double the risk of cardiovascular death in that group. Tea does not carry this same risk at high blood pressure levels, which gives it an edge for people managing hypertension.
How Brewing Method Affects Cholesterol
Unfiltered coffee contains oily compounds called diterpenes that raise LDL cholesterol. Boiled coffee (common in Scandinavian and Turkish traditions) has the highest concentrations. French press and percolator methods contain intermediate levels. Paper-filtered drip coffee has the lowest. Researchers estimated that switching three daily cups from an unfiltered method to paper-filtered coffee could lower LDL cholesterol enough to reduce heart disease risk by up to 13% over five years. If you drink coffee regularly, this is one of the simplest changes you can make. Tea contains negligible amounts of these cholesterol-raising compounds regardless of how you brew it.
Blood Sugar and Type 2 Diabetes
Both beverages show a clear dose-response relationship with lower mortality in people who have type 2 diabetes. In a study tracking diabetic patients, drinking four or more cups of green tea daily was associated with a 40% lower risk of dying from any cause. For coffee, two or more cups per day was linked to a 41% reduction. The trend held even after adjusting for diet, exercise, and other health factors.
The most striking finding: people who drank both beverages at high levels saw a 63% reduction in all-cause mortality compared to people who drank neither. This additive effect suggests that the different polyphenols in coffee and tea may work through complementary pathways rather than overlapping ones.
Mental Focus and Energy
Coffee and tea both contain caffeine, but they deliver it differently. A standard cup of coffee has roughly 80 to 100 mg of caffeine, while black tea has about 40 to 70 mg and green tea 20 to 45 mg. More caffeine means a stronger and faster boost to alertness, reaction time, and mental endurance.
Tea, however, contains an amino acid called L-theanine that changes how caffeine feels. Research published in Biological Psychology found that L-theanine combined with caffeine improved accuracy on attention tasks, sped up reaction times, and reduced self-reported mental fatigue more than caffeine alone. L-theanine also lowered cortisol levels, directly counteracting caffeine’s tendency to raise stress hormones. People who find coffee jittery or anxiety-inducing often tolerate tea well for this reason. The combination produces a calmer, more sustained focus rather than the sharp spike and crash that higher-dose caffeine can cause.
Gut Health and Digestion
Coffee has a measurable impact on the gut microbiome. Its chlorogenic acid increases populations of bacteria that produce short-chain fatty acids, compounds that strengthen the intestinal lining and reduce inflammation. Coffee consumption is also associated with higher levels of Bifidobacterium, a beneficial genus linked to improved digestion and immune function. The polyphenols in both coffee and tea promote growth of Lactobacillus, Akkermansia, and Faecalibacterium, all of which are markers of a healthy, diverse gut ecosystem.
The downside for coffee shows up in the upper digestive tract. Coffee’s natural acids irritate the stomach lining, and caffeine relaxes the muscular valve between your esophagus and stomach. This makes it easier for stomach acid to travel upward, which is why coffee is a common trigger for heartburn and acid reflux. It also stimulates additional gastric acid production, compounding the problem. Drinking large volumes or very hot coffee amplifies these effects. Tea is significantly gentler on the stomach, making it the better option if you’re prone to reflux or have a sensitive digestive system.
Iron Absorption
Both beverages interfere with your body’s ability to absorb iron from plant-based foods and supplements, but the effect can be dramatic. In women with iron deficiency anemia who took iron supplements with coffee in the morning, absorption dropped by 66%. Tea’s tannins have a similar inhibiting effect on non-heme iron (the type found in vegetables, grains, and supplements). If you’re managing low iron levels or rely on plant-based iron sources, drinking either beverage between meals rather than with them makes a significant difference.
Caffeine Limits and Safety
The FDA considers 400 mg of caffeine per day safe for most adults, which translates to roughly two to three 12-ounce cups of coffee. Because tea contains less caffeine per cup, you can drink more of it before approaching that ceiling. Four to five cups of black tea or six to eight cups of green tea would put you in the same range as two to three cups of coffee.
This matters most for people who are sensitive to caffeine’s effects on sleep, anxiety, or blood pressure. If you’re hitting 400 mg through coffee by early afternoon and still want a warm drink later in the day, switching to tea for your later cups gives you the polyphenol benefits without pushing past the recommended limit.
Which One to Choose
If you have high blood pressure or acid reflux, tea is the safer daily choice. If you tolerate caffeine well and want maximum antioxidant intake per cup, coffee has the edge. If you have concerns about cholesterol, use a paper filter for your coffee or lean toward tea. If you find coffee makes you anxious but you want sustained focus, tea’s combination of caffeine and L-theanine delivers a smoother experience.
The strongest evidence, though, points toward drinking both. The 63% reduction in mortality risk seen in people who combined green tea and coffee suggests that variety matters more than picking a winner. Three to four cups total per day, split between the two beverages, keeps you well within safe caffeine limits while exposing your body to the widest range of beneficial compounds.