Water is the healthiest drink you can reach for, and it should make up at least half your daily fluid intake. But a handful of other beverages offer genuine health benefits beyond hydration. A panel of nutrition researchers ranked common drinks into six tiers based on their calorie content, nutritional value, and evidence for health effects. The top three tiers, which form the foundation of a healthy drinking pattern, are water, unsweetened tea and coffee, and low-fat milk or soy milk.
Water: The Baseline
Water has zero calories, no additives, and does exactly what your body needs most from a drink. The general guideline for healthy adults is roughly 11.5 cups (2.7 liters) for women and 15.5 cups (3.7 liters) for men in total daily fluid, including fluid from food. Water should account for at least half of that.
If plain water feels boring, sparkling water is a fine substitute. Despite its slight acidity from carbonation, research comparing its effect on tooth enamel to regular water found the two were essentially identical. The key is to stick with plain sparkling water. Flavored versions with added sugar or citric acid are a different story.
Coffee and Tea
Unsweetened coffee and tea sit just below water in the beverage rankings, and for good reason. Both are calorie-free (or nearly so), rich in plant compounds that act as antioxidants, and backed by strong evidence linking them to lower disease risk.
Coffee has some of the most robust data. A large analysis pooling 36 studies and over 1.2 million participants found that drinking 3 to 5 cups per day was associated with a 15% lower risk of cardiovascular disease compared to drinking none. Even at 1.5 cups per day, the risk dropped by about 11%. Heavy coffee drinking (around 5 cups daily) didn’t raise cardiovascular risk either. The practical ceiling is about 400 milligrams of caffeine a day, which works out to roughly four 8-ounce cups of brewed coffee.
Green tea brings its own set of benefits. A standard cup contains 50 to 100 milligrams of a potent antioxidant compound that neutralizes free radicals before they can damage DNA and other cellular structures. This same compound helps reduce inflammation and supports fat metabolism by promoting fat burning and discouraging new fat storage in the liver. Black tea offers antioxidants too, though the specific compounds differ. The main rule for both coffee and tea: keep them unsweetened. Adding sugar, flavored syrups, or whipped cream turns a healthy drink into a dessert.
Milk and Plant-Based Alternatives
Low-fat cow’s milk provides protein, calcium, and vitamin D in a single glass. For adults, one to two glasses a day is a reasonable amount. More than that adds calories and saturated fat without proportional nutritional benefit. For growing children, two glasses a day covers what they need without being excessive.
If you prefer plant-based options, soy milk is the closest nutritional match to cow’s milk. It’s cholesterol-free, low in saturated fat, and offers a similar amount of protein. Most brands are fortified with calcium and vitamin D. Oat milk tends to have slightly more protein and fiber than other alternatives and is also commonly fortified. Almond milk is lower in calories but is often diluted with water, which means its nutritional value depends heavily on what the manufacturer adds back in.
The important thing with any plant milk is to check the label. Most don’t naturally contain calcium or vitamin D, so fortification is what closes the gap with cow’s milk. Protein content varies widely: soy and pea milks can match dairy, while almond, rice, and coconut milks typically fall well short.
100% Fruit Juice: Less Than You’d Think
Fruit juice has vitamins, but it also has a surprising amount of sugar. An 8-ounce glass of juice contains about 30 grams of sugar on average, roughly the same as a glass of cola. The difference is that juice sugar comes packaged with some vitamins and minerals, but commercial juicing strips away the skin and pulp, which are where most of the fiber lives. Without fiber, the sugar hits your bloodstream faster.
The recommended amount is small: no more than 4 ounces a day, which is half a standard cup. That’s enough to get some nutritional benefit without the calorie load of a full glass. If you want the vitamins from fruit, eating whole fruit is almost always the better choice because you get the fiber along with it.
Kombucha and Fermented Drinks
Kombucha has earned a reputation as a gut-health drink, but the science is more modest than the marketing. To qualify as a true probiotic product, a beverage needs to contain a specific minimum concentration of live beneficial bacteria. Most commercial kombucha falls short. When researchers tested 39 retail kombucha products, only about 6% of non-alcoholic versions and 10% of low-alcohol versions met the threshold for delivering an adequate probiotic dose. None of the alcoholic kombucha products made the cut.
Kombucha does contain organic acids and other bioactive compounds that could support gut health, but most of these benefits have only been demonstrated in lab or animal studies, not in human trials. It’s not a bad drink, especially compared to soda, but it’s not the probiotic powerhouse many people assume.
Diet Drinks and Artificial Sweeteners
Diet sodas and other beverages sweetened with non-sugar sweeteners occupy an awkward middle ground. They have zero or near-zero calories, which seems like an advantage, but the World Health Organization issued guidance in 2023 advising against using them for weight control. A systematic review found that non-sugar sweeteners provide no long-term benefit in reducing body fat in either adults or children.
More concerning, the same review flagged potential links between long-term use and increased risk of type 2 diabetes, cardiovascular disease, and mortality. The WHO noted that these associations could be influenced by the baseline health of the people studied, so the evidence isn’t definitive. Still, the recommendation is clear: if you’re choosing between diet soda and water, water is the better pick. If you’re using diet drinks to replace sugary ones, limiting yourself to one to two glasses a day is the suggested ceiling.
Sugary Drinks: The Bottom of the List
Sodas, sweetened iced teas, energy drinks, and other sugar-sweetened beverages rank last for a reason. They deliver calories with no meaningful nutrition, and the evidence linking them to weight gain, type 2 diabetes, and heart disease is extensive. The ideal intake is zero. If you do drink them, keeping it under 8 ounces a day is the maximum recommended amount.
Putting It All Together
A practical daily drinking pattern looks something like this: water as your primary beverage throughout the day, up to three or four cups of unsweetened coffee or tea, one to two glasses of low-fat milk or fortified soy milk if you drink it, and a small 4-ounce glass of 100% juice if you want it. That covers your fluid needs and adds meaningful nutrients without excess calories. Everything beyond that list, from diet drinks to kombucha to the occasional soda, is best treated as an extra rather than a staple.