Making low-fat mayonnaise at home comes down to replacing most of the oil with ingredients that mimic its creamy texture. Traditional mayonnaise is 65% to 75% fat by weight, so cutting that significantly requires thickeners, alternative bases, or both to keep the emulsion stable and spreadable. The good news: you can get a convincing result with as little as 10% to 30% oil if you use the right techniques.
Why Regular Mayonnaise Needs So Much Oil
Standard mayonnaise is an oil-in-water emulsion. Egg yolk acts as the emulsifier, coating tiny oil droplets and preventing them from merging back together. In a full-fat recipe, oil makes up the bulk of the volume, and all those tightly packed droplets are what give mayo its thick, spoonable body. When you remove most of the oil, you lose that structure. The result is thin, watery, and nothing like mayo unless you introduce something else to fill the gap.
This is exactly how commercial light mayonnaise works. Products like Hellmann’s Light use around 26% to 28% oil and rely on modified corn starch and xanthan gum to rebuild the thickness. Extra-light versions go as low as 3% fat and lean even more heavily on starch-based thickening. You can apply the same principles at home.
The Simplest Approach: Oil Plus Thickeners
The most straightforward method keeps the basic mayonnaise process (egg yolk, acid, oil, mustard) but cuts the oil by half or more and adds a thickener to compensate. Here’s what works:
- Xanthan gum is the most effective home-kitchen thickener for this purpose. A small amount, roughly 1/4 teaspoon per cup of mayo, creates a gel-like network in the water phase that prevents separation and mimics the body of full-fat mayo. Too much makes it slimy, so start small.
- Cornstarch or modified starch can be cooked into a thick paste with water, cooled, then blended into the emulsion. This is essentially what commercial brands do. Use about 1 tablespoon of cornstarch cooked with 1/2 cup of water as your base, then emulsify your reduced amount of oil into it.
- Mustard powder does double duty. It adds flavor and contains natural carbohydrates called mucilage that act as secondary emulsifiers, helping the reduced amount of oil stay dispersed.
A practical starting formula: 1 egg yolk, 1/3 cup oil (instead of the usual 3/4 cup), 1 tablespoon vinegar or lemon juice, 1 teaspoon mustard, 1/4 teaspoon xanthan gum, and a pinch of salt. Blend the egg yolk, mustard, acid, and xanthan gum first, then drizzle in the oil slowly while the blender runs. The xanthan gum compensates for the missing oil, giving you a mayo that’s roughly half the calories of the traditional version.
Yogurt and Tofu Bases
Another route skips the thickener-and-oil strategy entirely and builds the mayo on a creamy, protein-rich base. Greek yogurt and silken tofu are the two most common choices, and each brings a different trade-off.
Greek yogurt mayo is the fastest option. Blend full-fat or 2% Greek yogurt with a small amount of oil (1 to 2 tablespoons), a squeeze of lemon juice, mustard, and salt. The yogurt provides the body, tang, and protein structure. The result is noticeably tangier than traditional mayo, which works well in chicken salad, coleslaws, and dressings but may taste out of place on a sandwich if you’re expecting something neutral.
Silken tofu produces a milder, more neutral base. Use firm or extra-firm silken tofu (not regular tofu, which is too grainy) and blend it until completely smooth with oil, vinegar, mustard, and salt. Don’t press the tofu beforehand. Just drain the excess liquid from the package. The result is creamy, mild, and naturally low in fat, with the added benefit of being egg-free. It works especially well as a base for flavored aiolis where garlic or herbs carry the flavor.
Aquafaba: The Egg-Free Emulsifier
Aquafaba, the liquid from a can of chickpeas, has become a popular egg replacement in vegan and low-fat cooking. It contains small proteins, carbohydrates, and natural compounds called saponins that lower the tension between oil and water, allowing it to stabilize an emulsion much like egg yolk does.
To use it, replace the egg yolk with about 3 tablespoons of aquafaba and proceed with the same slow-drizzle technique. Because aquafaba is a weaker emulsifier than egg yolk, it helps to add a small amount of mustard and to use an immersion blender for maximum shear force. You can still reduce the oil significantly and add xanthan gum for extra stability. The result is vegan, lower in fat, and surprisingly close to the real thing in texture.
Keeping It Safe: Acidity Matters
Traditional mayonnaise relies on its acidity to inhibit bacterial growth, and this becomes more important in low-fat versions. With less oil, there’s more water available for bacteria to thrive in.
The key number is pH 4.1 or below. At this level, vinegar effectively controls Salmonella in raw-egg products. To reach it, use enough vinegar or lemon juice. A tablespoon of white vinegar per cup of mayo is a reasonable baseline, but the exact amount depends on your other ingredients. Yogurt-based versions are naturally acidic, which helps. If you’re using raw egg yolk and want extra insurance, use pasteurized eggs.
Homemade mayonnaise of any kind lacks the preservatives found in commercial products. Stored in the refrigerator, it typically lasts three to seven days. Keep it in a clean, sealed container, use a clean utensil each time you scoop from the jar, and discard it if you notice any off smell, discoloration, or visible separation that doesn’t remix with stirring.
Fixing Common Problems
Low-fat mayo is more finicky than the full-fat version because you have less oil holding everything together. Here are the issues you’re most likely to run into.
If your mayo is too thin, you likely need more thickener or less liquid. Add a tiny pinch of xanthan gum (whisked into a teaspoon of water first to prevent clumps) and blend again. Alternatively, a tablespoon of cooled cornstarch paste can rescue a runny batch.
If it separates in the fridge, the emulsion wasn’t stable enough from the start. This happens when oil is added too quickly or when there isn’t enough emulsifier relative to the oil. Warm temperatures accelerate separation because oil droplets move faster and merge together. Next time, drizzle the oil more slowly and consider adding mustard or a pinch of xanthan gum for insurance.
If the texture is gummy or slimy, you’ve used too much xanthan gum. There’s no great fix for this other than blending in more of the base ingredients (yogurt, tofu, or egg yolk) to dilute it. For future batches, measure xanthan gum carefully, keeping it at or below 1/4 teaspoon per cup of finished mayo.
Calorie Comparison
A tablespoon of traditional full-fat mayonnaise contains roughly 90 to 100 calories and 10 grams of fat. Light mayo, whether homemade or store-bought, lands around 35 to 50 calories per tablespoon with 3 to 5 grams of fat. Versions built on a yogurt or tofu base with minimal oil can drop below 20 calories per tablespoon. The savings add up fast if you use mayo regularly in sandwiches, tuna salad, or dressings.
The trade-off is always texture and richness. Full-fat mayo has a luxurious mouthfeel that’s hard to replicate perfectly. But a well-made low-fat version using the right thickeners or a creamy protein base gets surprisingly close, especially when the mayo is mixed into other foods rather than eaten on its own.