People with diabetes have plenty of options beyond plain water. Coffee, tea, certain milks, vegetable juices, and even some fermented drinks can fit into a blood sugar-friendly routine. The key is watching sugar and carbohydrate content per serving, since liquid calories tend to spike blood glucose faster than solid food does.
Coffee and Tea (Unsweetened)
Black coffee and plain tea are essentially zero-carb, zero-calorie drinks that work well for most people managing diabetes. Both contain antioxidants linked to improved metabolic health over time. The catch is caffeine. About 200 milligrams of caffeine (roughly two standard cups of coffee) can alter how your body uses insulin, potentially pushing blood sugar higher or lower depending on the person. If you notice your readings are less predictable on high-caffeine days, that’s worth paying attention to.
Green tea, black tea, and white tea are all fine choices when brewed without sugar. If you like flavored coffee drinks, skip the syrups and sweetened creamers. A splash of unsweetened almond milk or a small amount of half-and-half adds minimal carbs. The moment you order a caramel latte or chai with syrup, you’re looking at 30 to 50 grams of sugar per cup, which is essentially a dessert.
Herbal Teas and Infusions
Herbal teas are naturally caffeine-free and contain virtually no carbohydrates, making them an easy choice at any time of day. Chamomile, peppermint, rooibos, and ginger tea all have negligible effects on blood sugar.
Hibiscus tea stands out as particularly interesting for people with diabetes. Several human and animal studies have demonstrated its potential to lower blood pressure, blood glucose, and cholesterol. A clinical trial using about 10 ounces of hibiscus tea daily over 28 days found measurable benefits, and the tea is widely studied as a candidate for helping manage hypertension, diabetes, and high cholesterol. It has a tart, cranberry-like flavor and works well iced without sweetener. Just be sure any packaged hibiscus tea doesn’t include added sugar.
Vegetable Juices
Vegetable juices are a much smarter pick than fruit juices, which can contain as much sugar as soda. The best options have low glycemic loads, meaning they release sugar into your bloodstream slowly and in small amounts.
Celery juice is the lightest option, with a glycemic index of just 15 and only 3.6 grams of sugar per 8-ounce cup. Tomato juice comes in at a glycemic index of 35 with about 6 grams of sugar per cup. Carrot juice is a bit higher at 43 on the glycemic index and 9 grams of sugar per cup, so it’s worth limiting to a smaller portion or mixing it with celery or cucumber juice to dilute the sugar content.
Always check the label on store-bought vegetable juices. Many brands add sodium, sugar, or fruit juice blends that dramatically change the nutritional profile. A “vegetable blend” that lists apple juice as the second ingredient is not the same as straight tomato juice. Look at total carbohydrates and sugar per serving, and confirm the serving size matches what you’re actually pouring.
Milk and Milk Alternatives
Not all milks are equal when it comes to carbohydrate content, and the differences are significant enough to matter for blood sugar management. Here’s how common options compare per 8-ounce cup:
- Unsweetened soy milk: 3 grams of carbs, 9 grams of protein, 5 grams of fat
- Unsweetened almond milk: 4 grams of carbs, 1 gram of protein, 5 grams of fat
- Whole cow’s milk: 12 grams of carbs, 8 grams of protein, 8 grams of fat
- Skim cow’s milk: 12 grams of carbs, 9 grams of protein, almost no fat
Unsweetened soy milk is the strongest all-around choice. It has the fewest carbs of the group while matching cow’s milk in protein, which helps slow any blood sugar response. Unsweetened almond milk is even lower in carbs but provides very little protein, so it works better as a coffee addition than a standalone drink. Cow’s milk isn’t off-limits, but at 12 grams of carbs per cup, a large glass adds up quickly.
Oat milk deserves a note of caution. Even unsweetened versions typically contain 16 or more grams of carbs per cup because oats are naturally starchy. It’s one of the higher-carb milk alternatives and can cause a noticeable glucose spike. If you enjoy it, treat it as a small addition rather than a full glass.
The word “unsweetened” is critical here. Sweetened vanilla almond milk, for instance, can contain 15 or more grams of sugar per cup, erasing any advantage over regular milk.
Kombucha
Kombucha is fermented tea that contains probiotics, organic acids, and varying amounts of residual sugar. A small randomized controlled pilot study in people with diabetes found that drinking kombucha lowered average fasting blood glucose from 164 to 116 mg/dL over four weeks, a meaningful drop. A separate study in healthy adults showed that kombucha consumed alongside a carbohydrate-rich meal significantly reduced the post-meal spike in both glucose and insulin compared to a placebo.
The challenge with kombucha is that sugar content varies wildly between brands. Some commercial kombuchas contain 2 to 4 grams of sugar per serving, while others pack 15 grams or more. Read the nutrition label carefully. Look for brands with under 5 grams of sugar per 8-ounce serving, and be aware that many bottles contain two servings even though they look like a single drink. Starting with a small amount and checking your glucose response is a practical way to see how your body handles it.
Sugar-Free Electrolyte and Sports Drinks
Regular sports drinks like Gatorade and Powerade are loaded with sugar and designed for athletes burning through glycogen during intense exercise. They’re a poor everyday choice for anyone managing diabetes. Sugar-free or “zero” versions replace the sugar with artificial sweeteners like sucralose or aspartame and provide the electrolytes (sodium, potassium, magnesium, calcium) your body loses through sweat.
The American Diabetes Association notes that sugar-free sports drinks are the simpler option for people with diabetes, though consuming artificial sweeteners in excessive amounts is not recommended. For most daily hydration, you don’t need electrolyte replacement at all. These drinks make the most sense during extended exercise, hot weather, or if you’re prone to dehydration. Plain water with a pinch of salt and a squeeze of lemon covers most electrolyte needs without the additives.
Drinks Worth Limiting or Avoiding
Fruit juice is the biggest trap. Even 100% juice with no added sugar delivers a concentrated dose of fructose without the fiber that whole fruit provides to slow absorption. An 8-ounce glass of orange juice contains about 26 grams of sugar and will spike blood glucose rapidly. If you enjoy fruit flavor, a small splash of juice diluted in sparkling water gives you the taste with a fraction of the sugar.
Regular soda, sweetened iced teas, energy drinks, and specialty coffee drinks are all high-sugar choices that cause fast, significant blood sugar spikes. Diet sodas avoid the sugar issue but come with ongoing debate about whether artificial sweeteners affect insulin sensitivity or gut health over time. Using them occasionally as a bridge away from sugary drinks is a reasonable approach, but relying on them as your primary beverage is less ideal than building habits around water, tea, and coffee.
Alcohol is another category that requires care. It can cause both highs and lows in blood sugar depending on the type of drink, whether you’ve eaten, and what medications you take. Dry wines and light beers tend to have fewer carbs than cocktails mixed with juice or soda, but alcohol’s interaction with diabetes medications makes portion control especially important.