Water is the healthiest drink you can choose, and it’s the only beverage the FDA specifically includes in its updated “healthy” labeling criteria. But beyond water, several drinks offer real nutritional benefits: unsweetened tea, coffee in moderation, milk or fortified soy milk, and fermented options like kefir. The key is knowing what each one actually does for your body and where the line sits between helpful and overhyped.
Water Comes First
Average daily water needs land around 15.5 cups for men and 11.5 cups for women, according to current guidelines. That total includes water from food (which accounts for roughly 20% of intake), so you don’t need to drink that entire amount from a glass. Still, plain water is the baseline. It has no sugar, no calories, no additives, and no downsides.
If you find plain water boring, sparkling water is a popular swap, but it’s worth knowing the tradeoff. Commercial carbonated waters range in pH from about 4.18 to 5.87. Tooth enamel starts dissolving at a pH of 5.5, and lab studies show that teeth exposed to carbonated water experience more enamel erosion than those exposed to still water. Drinking sparkling water occasionally is fine, but sipping it constantly throughout the day exposes your teeth to a mildly acidic environment for hours. Drinking it with meals rather than between them helps minimize contact time.
Tea and Coffee
Unsweetened green and black tea are among the most well-supported healthy beverages outside of water. Green tea contains a potent antioxidant compound that helps relax blood vessels, reduce arterial stiffness, and support the body’s production of nitric oxide, a molecule that keeps blood vessels flexible. Animal and human studies have shown blood pressure reductions of roughly 8 to 10% with regular consumption over two or more weeks. Black tea offers similar antioxidant benefits, though the specific compounds differ slightly after the fermentation process.
Coffee is healthy for most adults when consumed plain or with minimal additions. The FDA considers up to 400 milligrams of caffeine per day safe for most adults. That translates to roughly two to three 12-ounce cups of brewed coffee. At that level, coffee is linked to lower rates of several chronic diseases. The problems start when coffee becomes a vehicle for large amounts of sugar and cream. A plain black coffee has about 5 calories. A flavored coffeehouse drink can exceed 400.
Herbal teas like chamomile, peppermint, and rooibos are caffeine-free and contribute to your daily fluid intake without any downside. They don’t carry the same cardiovascular research as green tea, but they’re a solid choice if you’re looking for a warm, calorie-free drink.
Milk and Plant-Based Alternatives
Cow’s milk delivers a combination of protein, calcium, and other nutrients that’s hard to match. A cup contains over 8 grams of protein and roughly 300 milligrams of calcium. Among plant-based alternatives, soy milk is the only one that comes close nutritionally. Soy drinks average about 3.8% protein, comparable to cow’s milk, while most other alternatives (almond, oat, rice, coconut) contain 1% protein or less. They’re not equivalent substitutes unless you’re getting protein elsewhere.
Calcium is the other major consideration. Unfortified plant milks contain significantly less calcium than cow’s milk. Fortified versions close that gap, and some fortified soy milks actually match or exceed dairy in both calcium and vitamin D content. If you’re choosing a plant-based milk, check the label for fortification and shake the carton well, since added minerals tend to settle at the bottom.
Fermented Drinks
Kefir and kombucha both contain live microorganisms that may benefit gut health, but they’re not interchangeable. Kefir is made from milk (or sometimes water) fermented with a complex grain culture containing dozens of bacterial and yeast species, including several well-studied probiotic strains like Lactobacillus acidophilus and Bifidobacterium lactis. It’s also a source of protein and calcium, making it nutritionally closer to a drinkable yogurt.
Kombucha is fermented sweet tea. Its microbial community is dominated by acetic acid bacteria and yeast, and while it does contain some probiotic organisms, the strains and concentrations vary enormously between brands and batches. Many commercial kombuchas also contain added sugar, sometimes as much as a soda. Check the nutrition label: a healthy kombucha should have under 5 grams of sugar per serving. Anything above 10 grams is essentially a sweetened tea with a probiotic halo.
Vegetable Juice
Vegetable juice can be a convenient way to increase your vegetable intake, but sodium is the main concern. A standard 8-ounce serving of commercial vegetable juice contains around 480 milligrams of sodium, which is roughly 20% of the recommended daily limit, packed into a single glass. Low-sodium versions cut that substantially and are the better pick.
On the positive side, that same serving provides 120% of the daily value of vitamin C, 40% of vitamin A from naturally occurring beta-carotene, 470 milligrams of potassium, and 20 milligrams of lycopene, all for just 50 calories. The tradeoff is fiber: juicing removes most of the fiber you’d get from eating whole vegetables. Vegetable juice works best as a supplement to whole vegetables, not a replacement.
Sports and Electrolyte Drinks
Electrolyte drinks are unnecessary for most people during most exercise. For workouts lasting under 90 minutes, water alone is sufficient. Your regular meals already replace the sodium, potassium, and other minerals you lose through sweat. Electrolyte beverages become genuinely useful during prolonged exercise lasting longer than 90 minutes, when your body benefits from both fluid and carbohydrate replacement to maintain performance.
The exception is exercising in extreme heat, especially during the first few days of hot-weather training before your body acclimates. In those conditions, extra sodium may help even during shorter sessions. Outside of those specific scenarios, electrolyte drinks are just flavored sugar water with a fitness label. Many contain 20 to 35 grams of sugar per bottle, comparable to a soft drink.
What Makes a Drink Unhealthy
The dividing line between a healthy and unhealthy drink almost always comes down to added sugar. Soda, sweetened iced teas, fruit punches, energy drinks, and most coffeehouse specialty drinks deliver large amounts of liquid sugar that your body processes quickly without any of the satiety signals you get from solid food. A single 20-ounce soda can contain 65 grams of added sugar, well over the recommended daily limit.
Fruit juice occupies a gray zone. It contains real vitamins and minerals, but even 100% juice delivers a concentrated dose of natural sugar without the fiber that slows absorption when you eat whole fruit. Keeping juice to a small glass (about 4 to 6 ounces) and choosing whole fruit the rest of the time gives you the nutrients without the sugar spike.
Diet sodas and artificially sweetened drinks avoid the sugar problem but come with their own open questions about long-term metabolic effects. They’re not toxic, but they don’t contribute anything positive either. If you’re trying to move away from sugary drinks, they can serve as a stepping stone, but water, tea, and coffee are better long-term destinations.