Regular mayonnaise has about 100 calories per tablespoon, almost all of it from fat. That sounds alarming, but the fat in mayo is mostly unsaturated, which puts it in a different category than many people assume. Whether mayo counts as “healthy” depends less on the brand you pick and more on the type of oil it uses, what gets added alongside it, and how much you eat.
Why Regular Mayo Isn’t as Bad as Its Reputation
Mayo’s core ingredients are simple: oil, egg yolks, and an acid like vinegar or lemon juice. The oil makes up the vast majority of the product, and in most commercial brands, that oil is soybean oil. Soybean oil is rich in polyunsaturated fats, which lower LDL (“bad”) cholesterol more effectively than the monounsaturated fats found in olive or avocado oil. That’s a point the Center for Science in the Public Interest has highlighted: all oils in mayo are largely unsaturated, including the ones that sound less trendy.
The cholesterol content is modest. A typical 15 to 20 gram serving of egg yolk mayonnaise contains roughly 22 to 30 milligrams of cholesterol. For context, current dietary guidelines no longer set a strict daily cholesterol cap, though they still recommend keeping intake reasonable. A tablespoon of mayo on a sandwich isn’t moving the needle much.
The real issue with mayo is caloric density. At 100 calories per tablespoon, it’s easy to add several hundred calories to a meal without noticing, especially if you’re generous with potato salad or tuna. Portion size matters more than which jar you buy.
Avocado Oil and Olive Oil Mayonnaise
Avocado oil mayo and olive oil mayo have become the go-to “healthy” alternatives, and they do have some advantages. Both oils are high in monounsaturated fat, which supports heart health and is linked to reduced inflammation. But the calorie count is essentially the same as regular mayo, around 90 to 100 calories per tablespoon. Swapping oil type doesn’t change the energy density.
There’s also a labeling issue worth knowing about. Many “olive oil mayonnaise” products use olive oil as a secondary ingredient, with soybean or canola oil still making up the bulk. Check the ingredient list rather than the front label. If soybean oil appears first, the product is mostly soybean oil with a splash of olive oil for marketing purposes.
Avocado oil mayo tends to be more straightforward in this regard, with avocado oil often listed as the primary fat. Brands like Primal Kitchen built their reputation on using avocado oil exclusively, along with fewer additives. These products typically skip the preservatives and modified starches found in conventional brands, which matters to some people more than the fat profile.
The Omega-6 Question
One concern that comes up in nutrition circles is the omega-6 fatty acid content of soybean oil mayo. In lab analysis, a standard soybean oil mayonnaise contains about 50% omega-6 fatty acids and only 6.5% omega-3s. That’s roughly a 7.7-to-1 ratio of omega-6 to omega-3. Most nutrition researchers consider a lower ratio preferable, since high omega-6 intake relative to omega-3 is associated with increased inflammatory markers.
In practice, a tablespoon of mayo isn’t a major driver of your overall omega-6 intake compared to cooking oils, fried foods, and processed snacks. But if you already eat a diet heavy in seed oils from multiple sources, choosing an avocado oil or olive oil mayo does reduce one stream of omega-6. Adding omega-3-rich ingredients to your meal, like a piece of salmon in that sandwich, does more to improve the ratio than switching mayo brands.
What “Light” Mayo Actually Changes
Light or reduced-fat mayonnaise cuts the fat content by at least 50%, which drops the calorie count significantly, often to around 35 to 50 calories per tablespoon. The tradeoff is what replaces the fat. Manufacturers use thickeners like modified food starch, xanthan gum, or newer alternatives like microfibrillated cellulose to mimic the creamy texture that fat normally provides. Water typically becomes a primary ingredient.
Some light mayonnaises also add sugar to compensate for the flavor lost when fat is removed. Not all do, so reading the nutrition label is worth the five seconds. If added sugars appear on the label, even a gram or two per serving, that’s a swap you may not want to make if your goal is reducing processed ingredients overall. Still, for people focused purely on calorie reduction, light mayo is a legitimate tool. The texture is thinner and the flavor is milder, but on a sandwich with other strong flavors, most people won’t notice the difference.
Additives in Commercial Mayo
Standard commercial mayonnaise typically contains calcium disodium EDTA, a preservative that binds to trace metals in the product to prevent discoloration and off-flavors. It extends shelf life significantly. For most people, this additive is a non-issue. The typical daily intake from food is estimated at about 0.1 milligrams per pound of body weight, well below the acceptable limit of 0.9 milligrams per pound.
One exception worth noting: animal research has suggested that EDTA may worsen intestinal inflammation in subjects that already have pre-existing gut inflammation, potentially disrupting the intestinal barrier at higher doses. This is preliminary and based on animal models, but people with inflammatory bowel conditions may want to choose brands without it. “Clean label” mayonnaises, whether avocado oil or traditional, often skip EDTA and rely instead on shorter shelf lives and refrigeration.
Making Mayo at Home
Homemade mayonnaise gives you complete control over the oil, the egg quality, and the absence of preservatives. A basic recipe is just egg yolk, oil, mustard, and lemon juice or vinegar. You can use extra virgin olive oil for a peppery flavor, avocado oil for something neutral, or a blend. The nutritional profile depends entirely on your oil choice, but the calorie density will be similar to store-bought since the ratio of oil to other ingredients stays roughly the same.
The practical limitation is shelf life. Homemade mayo lasts only 10 to 14 days in the refrigerator, and that’s under ideal conditions: sealed container, kept at or below 4°C (40°F). Raw egg yolks carry a small risk of Salmonella, so using pasteurized eggs eliminates that concern entirely. Without synthetic antioxidants, the oils in homemade mayo also oxidize faster, so you’ll notice flavor changes sooner than with a commercial product. If you go through mayo slowly, homemade isn’t practical. If you use it regularly, it’s a genuinely better option in terms of ingredient simplicity.
What “Healthy” Actually Looks Like Here
The FDA updated its criteria for what foods can carry a “healthy” label. For oil-based spreads and dressings, the product needs to keep saturated fat below 20% of total fat, sodium under 230 milligrams per serving, and added sugars near zero. Most full-fat mayonnaises already meet or come close to these thresholds, since the dominant fats are unsaturated and sugar isn’t a traditional mayo ingredient. The saturated fat in a tablespoon of mayo is typically 1 to 1.5 grams, a small fraction of the total fat content.
So is there a healthy mayonnaise? The honest answer is that standard mayo, used in reasonable amounts, isn’t the dietary villain it’s been made out to be. If you want to optimize, choose a mayo where the oil you prefer is actually the first ingredient, check that added sugars are zero, and keep your serving close to a tablespoon. The difference between a “healthy” mayo and a regular one is smaller than most marketing suggests. The difference between a tablespoon and three tablespoons matters a lot more.