Pure tequila contains zero grams of sugar and zero grams of carbohydrates per standard 1.5-ounce shot. A single serving has about 97 calories, all of which come from the alcohol itself. That makes tequila one of the lowest-sugar options among alcoholic drinks, though the full picture has a few important nuances worth understanding.
What’s Actually in a Shot of Tequila
During distillation, the sugars from the agave plant are fermented and converted into ethanol. By the time tequila reaches the bottle, virtually no sugar remains. A 1.5-ounce pour of 80-proof tequila delivers 97 calories, 0 grams of carbohydrates, 0 grams of fat, and 0 grams of protein. The 14 grams of pure alcohol in that shot account for every one of those calories.
This applies to all straight distilled spirits. Vodka, whiskey, rum, and gin are also essentially sugar-free in their unflavored forms. Tequila doesn’t have a special advantage here. Where things get complicated is what happens before and after the spirit reaches your glass.
The Hidden Sugar Loophole
Mexico’s Consejo Regulador del Tequila (CRT), the governing body for tequila production, permits four additives in any tequila, including bottles labeled “100% agave”: caramel coloring, oak extract, glycerin, and sugar syrup. Brands can use these up to 1% of total volume without ever disclosing them on the label. That means a tequila can legally say “100% agave” and still contain added sugar syrup used to smooth out the flavor.
The phrase “100% agave” only means no other sugars were used during fermentation. It says nothing about what was added afterward. If avoiding added sugar matters to you, look for brands that voluntarily claim “additive-free” status. This isn’t an official regulated term, but brands making that claim publicly stake their reputation on it, and several submit to third-party testing to back it up. Blanco (unaged) tequilas are the least likely to contain additives, since there’s less flavor to manipulate.
Even with additives, the sugar content at 1% by volume is tiny. In a 1.5-ounce shot, you’re looking at a fraction of a gram at most. For most people, this is negligible. But if you’re carefully tracking every gram of sugar for medical reasons, it’s worth knowing the loophole exists.
What Mixers Do to the Math
The zero-sugar status of tequila disappears the moment you add a margarita mix, simple syrup, or fruit juice. A classic margarita can contain 20 to 30 grams of sugar depending on the recipe. Pre-made margarita mixes are particularly heavy on added sweeteners. If keeping sugar low is the goal, your best options are tequila neat, on the rocks, or mixed with soda water and a squeeze of fresh lime.
Agavins vs. Agave Syrup
You may have seen claims that tequila contains “agavins,” a type of fiber from the agave plant that doesn’t raise blood sugar. This is technically true of the raw agave plant but misleading when applied to tequila. Agavins are long chains of fructose molecules that human digestive enzymes can’t break down. They pass through the stomach and small intestine intact, reaching the large intestine where gut bacteria ferment them. In that sense, they behave more like dietary fiber than sugar.
However, the distillation process breaks down and removes these compounds. Finished tequila doesn’t contain meaningful amounts of agavins. The agave plant’s beneficial fiber doesn’t survive the journey into the bottle. Agave syrup (sometimes sold as agave nectar) is a different product entirely. It’s a concentrated sweetener made from agave sap, composed of up to 90% fructose, with a glycemic index between 10 and 27. Despite being marketed as a healthier alternative to table sugar, overconsumption of fructose is linked to fat accumulation in the liver and insulin resistance.
How Tequila Affects Blood Sugar
Even though tequila itself contains no sugar, it still has a real effect on blood glucose. When you drink alcohol, your liver prioritizes breaking down ethanol over its other jobs, including releasing stored glucose into your bloodstream. This can cause blood sugar to drop, sometimes to dangerously low levels, especially if you drink on an empty stomach.
The American Diabetes Association notes that wine and spirits are “practically carbohydrate free” and that moderate drinking (one to two drinks per day) may actually be associated with improved blood sugar management and insulin sensitivity over time, with some people seeing lower A1C levels during periods of moderate consumption. But the organization also warns that your liver will choose to metabolize alcohol over maintaining blood glucose, which can lead to hypoglycemia. Eating food while you drink helps prevent this.
For people managing diabetes or prediabetes, the zero-carb label on tequila can be misleading if it creates a false sense of safety. The drink won’t spike your blood sugar the way a soda would, but the indirect effects on liver function and glucose regulation still matter.
Tequila on a Low-Carb or Keto Diet
With zero carbs and zero sugar, tequila is technically compatible with ketogenic and low-carb diets. It won’t contribute any carbohydrates toward your daily limit. That said, alcohol does interfere with the metabolic state that makes these diets work. When your liver processes ethanol, it produces acetate, which your body will burn as fuel before returning to burning fat. This effectively pauses fat oxidation for as long as your body is clearing the alcohol from your system.
A single shot won’t knock you out of ketosis permanently, but it will slow things down. Your body treats alcohol as a priority toxin to clear, and everything else, including fat burning, takes a back seat until that job is done. If weight loss is the goal, frequent drinking will slow your progress regardless of how many carbs are in the drink.
The practical takeaway: straight tequila is one of the better alcohol choices if you’re watching sugar or carb intake, but “sugar-free” doesn’t mean “consequence-free” when it comes to how your body processes it.