Yes, mayo is one of the most low-carb-friendly condiments you can use. A tablespoon of full-fat mayonnaise contains just 0.5 grams of carbohydrates, along with about 10.6 grams of fat and almost no protein. Whether you’re following keto, Atkins, or a general low-carb approach, regular mayonnaise fits comfortably into your daily carb budget.
Carb Counts Across Major Brands
The popular full-fat mayonnaise brands are essentially interchangeable when it comes to carbs. Duke’s Real Mayonnaise, Hellmann’s Real Mayonnaise, and Kraft Real Mayo all contain roughly 0 grams of net carbs per tablespoon. The trace amount (around half a gram) comes from small quantities of sugar and other minor ingredients, but it’s low enough that most labels round down to zero.
If your brand lists sugar in the ingredients, counting each tablespoon as 0.5 grams of net carbs rather than zero gives you a more accurate daily total. Even at that rate, you’d need to eat an unrealistic amount of mayo before carbs became a concern.
Light Mayo and Miracle Whip Have More Carbs
Light and reduced-fat versions tell a slightly different story. When manufacturers remove fat, they often compensate with starches or sweeteners to maintain texture and flavor. Kraft Light and Miracle Whip Light each contain under 1 gram of added sugar per tablespoon, and regular Miracle Whip has a full gram. These amounts are still small, but they add up faster if you’re generous with portions.
Hellmann’s Light, Hellmann’s Olive Oil, and Duke’s Light are better low-carb picks in the reduced-fat category, all showing 0 grams of added sugar per serving. If you prefer a lighter mayo, checking the label is worth the few seconds it takes.
Plant-Based Mayo Works Too
Vegan and plant-based mayonnaise options are comparable to their egg-based counterparts. Brands like Follow Your Heart Vegenaise, JUST Mayo, Hellmann’s Plant Based, and Sir Kensington’s Classic Vegan Mayo all contain 0 grams of added sugar per tablespoon. A homemade vegan mayo recipe typically comes in around 1 gram of carbs per tablespoon. Either way, plant-based mayo remains solidly low carb.
How Mayo Affects Blood Sugar
Mayo doesn’t just avoid raising your blood sugar on its own. It can actually slow the blood sugar spike from high-carb foods you eat it with. A study published in Bioscience, Biotechnology, and Biochemistry found that when participants ate rice with a tablespoon of mayonnaise, their blood glucose peaked significantly lower at 30 and 45 minutes compared to eating the same rice without mayo. The overall blood sugar response, measured as the area under the curve, was also reduced.
The fat in mayonnaise slows digestion, which means glucose enters your bloodstream more gradually. This doesn’t make a high-carb meal low carb, but it does soften the glycemic impact. Insulin levels stayed about the same in both groups, suggesting the body needed less insulin relative to the glucose absorbed.
Choosing the Right Oil Matters More Than Carbs
Since mayo is almost entirely fat, the type of oil matters more than the carb count for overall health on a low-carb diet. Most conventional mayonnaise is made with soybean oil, and cheaper brands use canola, sunflower, or safflower oil. These are high in omega-6 fatty acids and oxidize more easily, which can promote inflammation.
If you want a cleaner option, look for mayonnaise made with avocado oil, macadamia oil, olive oil, or coconut oil. These contain more stable fats that resist oxidation. Brands like Chosen Foods, Primal Kitchen, and Sir Kensington’s Avocado Oil all use avocado oil as the primary fat and still register 0 grams of added sugar per serving. The carb count is identical to conventional brands, but the fat quality is better suited to the goals most low-carb dieters have in mind.
Watch for Hidden Sugars in Flavored Varieties
Plain mayo is reliably low carb, but flavored versions deserve a closer look. Most flavored options stay at 0 grams of added sugar per tablespoon, including garlic aioli, chipotle, and harissa varieties from major brands. A few creep upward: Lee Kum Kee Sriracha mayo contains 1 gram of added sugar, and Hellmann’s Spicy and Heinz Mayoracha each have under 1 gram.
The ingredient to scan for is sugar listed near the top of the ingredients panel. Hellmann’s Real Mayonnaise, for example, lists its ingredients as soybean oil, water, whole eggs and egg yolks, vinegar, salt, sugar, and lemon juice. Sugar appears, but it’s far enough down the list that the amount per serving is negligible. When sugar or corn syrup appears higher up, or when multiple sweeteners are listed, the carb count climbs.
For the strictest low-carb tracking, stick with full-fat, plain mayonnaise made with a stable oil. At half a gram of carbs or less per tablespoon, it’s one of the few condiments you genuinely don’t need to worry about.