Water is the single best drink for people with diabetes, but it’s far from the only option. The key is knowing which beverages have hidden sugars, which ones affect blood sugar in unexpected ways, and which are genuinely safe choices. Most drinks fall into a gray area that depends on portion size, timing, and what else you’re eating.
Water and Infused Water
Plain water has zero carbohydrates, zero calories, and no effect on blood sugar. It’s the baseline. If you find plain water boring, infusing it with slices of cucumber, lemon, lime, or fresh mint adds flavor without meaningful carbohydrates. Sparkling water and seltzer are equally fine, as long as there’s no added sugar or juice listed on the label.
Coffee and Tea Without the Extras
Black coffee and unsweetened tea are close to zero-calorie drinks that most people with diabetes can enjoy freely. The caffeine question is more nuanced than you might expect, though. Caffeine can temporarily reduce your body’s ability to use insulin effectively, partly by blocking receptors in muscle tissue that help absorb glucose. A dose equivalent to about two cups of coffee has been shown to decrease insulin sensitivity in younger adults in controlled studies.
That said, long-term coffee consumption, whether caffeinated or decaf, does not appear to worsen insulin resistance over time. Researchers have concluded there’s no reason to restrict coffee intake in people with diabetes based on insulin sensitivity concerns alone. The real problem with coffee is what people add to it. Flavored creamers, syrups, and sugar can turn a zero-carb drink into a dessert. A large flavored latte from a coffee chain can easily contain 40 to 60 grams of carbohydrates.
Green tea and black tea are similarly safe unsweetened. Herbal teas like hibiscus (sometimes called roselle tea) and mate tea have been traditionally used in parts of Asia and South America and show some early signals for supporting glucose and lipid metabolism. However, evidence that any tea meaningfully improves blood sugar control in people with type 2 diabetes is limited. A meta-analysis found tea consumption could help maintain stable fasting insulin levels, but didn’t show significant effects on fasting blood glucose itself. Drink tea because you enjoy it, not as a treatment strategy.
Milk and Plant-Based Alternatives
Cow’s milk contains about 3.4 grams of carbohydrates per 100 milliliters (roughly 12 grams per 8-ounce glass), along with about 3.3 grams of protein per 100 mL. That protein and fat content slows digestion, which helps moderate blood sugar spikes compared to a drink with the same carbohydrates but no protein.
Plant-based milks vary wildly. Unsweetened soy milk tends to run around 1 to 2.5 grams of carbohydrates per 100 mL with a decent protein content of about 2 grams. Unsweetened almond milk is often the lowest-carb option, with some brands coming in under 1 gram of carbohydrates per 100 mL. Oat milk is the outlier: it typically has carbohydrate levels similar to cow’s milk (around 3.4 grams per 100 mL) but with very little protein (under 0.5 grams per 100 mL), which means less to slow the glucose response. If you’re choosing a plant milk, check the label for added sugars. “Original” versions of almond and soy milk often contain significantly more carbohydrates than their unsweetened counterparts.
Fruit Juice: Smaller Than You Think
Fruit juice is one of the trickiest beverages for blood sugar management because it feels healthy but delivers a concentrated dose of sugar with little fiber to slow absorption. A standard 200 mL serving (about 7 ounces) of orange juice contains roughly 25 grams of available carbohydrates. That’s as much as a slice and a half of bread, and it hits your bloodstream faster because there’s no fiber to slow things down.
Not all juices are equal in their glycemic impact. Florida orange juice has a glycemic index around 51 (classified as low), while tangerine orange juice scores even lower at about 34. Mixed berry juices and vegetable-fruit blends tend to score higher, in the medium range of 63 to 70. If you do drink juice, keeping your portion to 4 ounces (half a cup) and pairing it with a meal that includes protein or fat can soften the blood sugar spike. But whole fruit is almost always a better choice, since the intact fiber slows glucose absorption considerably.
Vegetable Juice
Tomato juice and vegetable juice blends are lower in carbohydrates than fruit juice. An 8-ounce cup of tomato juice has about 9 grams of carbohydrates and 40 calories, roughly a third of what you’d get from the same amount of orange juice. The catch is sodium. Commercial tomato juice with added salt packs around 600 mg of sodium per 8-ounce serving, which is about a quarter of the daily recommended limit. Since many people with diabetes also manage blood pressure, that matters. Look for low-sodium versions, which drop to around 25 mg per serving.
Diet Sodas and Artificially Sweetened Drinks
Diet sodas and zero-sugar versions of popular drinks won’t spike your blood sugar in the moment. They contain no carbohydrates. But the longer-term picture is less reassuring. The World Health Organization issued guidance in 2023 recommending against using non-sugar sweeteners as a strategy for weight control or reducing the risk of chronic diseases. Their systematic review found that these sweeteners don’t help reduce body fat over the long term, and the data suggests potential associations with increased risk of type 2 diabetes, cardiovascular disease, and mortality.
This applies to the full range of common sweeteners: aspartame, sucralose, stevia and its derivatives, saccharin, and acesulfame potassium. The WHO guidance isn’t a toxicity warning. It’s not saying these sweeteners are poisonous at normal doses. It’s saying that relying on them as a health strategy doesn’t appear to deliver the benefits people expect. An occasional diet soda is unlikely to be harmful, but making it your primary beverage instead of water isn’t a swap that helps your health.
Sports and Electrolyte Drinks
For everyday activity, water is enough to keep you hydrated. The American Diabetes Association notes that sports drinks with electrolytes and carbohydrates can be useful during prolonged exercise like long-distance running, cycling, or multi-hour outdoor events, but the average workout doesn’t call for them.
If you want electrolytes without the sugar, zero-sugar versions of brands like Gatorade and Powerade use sucralose or aspartame for flavor instead of sugar. These won’t raise your blood sugar directly. For longer or more intense exercise, a regular sports drink might actually help prevent blood sugar from dropping too low, especially if you take insulin. That’s a situation where some fast-acting carbohydrates can be protective rather than problematic.
Alcohol: Timing and Quantity Matter
Alcohol is uniquely tricky for people with diabetes because it can cause blood sugar to drop hours after you drink, not just in the moment. Your liver normally releases stored glucose to keep your levels steady, but when it’s busy processing alcohol, that function gets interrupted. This delayed effect means low blood sugar can hit you while you’re asleep, which is why checking your blood sugar before bed after drinking is important.
The general guideline is no more than one drink per day for women and two for men. One drink means 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of spirits. A few practical rules make alcohol safer:
- Always eat when you drink. Food slows alcohol absorption and helps stabilize blood sugar.
- Skip exercise after drinking. Physical activity combined with alcohol compounds the risk of low blood sugar.
- Check your glucose more often. Monitor before drinking, while drinking, a few hours after, and up to 24 hours later.
- Drink with someone who knows you have diabetes and would recognize signs of low blood sugar.
Beer and sweet cocktails carry extra carbohydrates on top of the alcohol itself. Dry wines and spirits mixed with soda water or diet mixers are lower-carb options. Avoid drinks made with regular soda, tonic water (which contains sugar, unlike soda water), or fruit juice mixers.
Why Sugary Drinks Are Worth Eliminating
Regular soda, sweet tea, energy drinks, and fruit punch are the highest-impact beverages to cut. A 2024 analysis published in Nature Medicine estimated that sugar-sweetened beverages were responsible for 2.2 million new type 2 diabetes cases and 1.2 million new cardiovascular disease cases worldwide in 2020 alone. That represents nearly 10% of all new type 2 diabetes cases globally. In Latin America and the Caribbean, sugar-sweetened beverages accounted for roughly 24% of new diabetes cases.
These drinks deliver large amounts of rapidly absorbed sugar with no protein, fat, or fiber to buffer the spike. A single 20-ounce bottle of regular soda contains roughly 65 grams of sugar. For someone managing diabetes, that’s the equivalent of consuming their entire meal’s worth of carbohydrates in liquid form, with no nutritional value attached. Swapping sugary drinks for water, unsweetened tea, or black coffee is consistently one of the highest-impact dietary changes a person with diabetes can make.