Kewpie mayonnaise is not healthier than regular mayonnaise. It has a similar calorie and fat profile, 43% more sodium than the average mayonnaise, and contains MSG as a flavor enhancer. Where it does differ is in its ingredient simplicity: no preservatives like EDTA, and egg yolks instead of whole eggs, which changes the flavor and texture more than the nutritional picture.
Calories and Fat Are Nearly Identical
Kewpie clocks in at about 694 calories per 100 grams, with 74 grams of fat. Standard American mayonnaise brands land in roughly the same range, typically 680 to 720 calories per 100 grams. The primary oil in Kewpie is a blend of rapeseed (canola) and soybean oil, both common vegetable oils also found in most Western mayo brands. In terms of raw calorie and fat content, the two are essentially interchangeable.
Kewpie’s saturated fat is relatively low at 6.6 grams per 100 grams, which is comparable to or slightly below many regular mayonnaise products. This comes down to the oil choice: rapeseed oil is naturally lower in saturated fat. But the difference is small enough that it won’t meaningfully change your daily intake.
Kewpie Has Significantly More Sodium
This is one of the clearest nutritional differences. Kewpie contains about 1.8 grams of salt per 100 grams, which is 43% higher than the category average of 1.26 grams for mayonnaise products. Part of that sodium comes from the salt itself, and part comes from MSG (listed as E621 on the label), which is estimated at less than 2% of the total ingredients.
MSG is safe for the vast majority of people. Decades of research have confirmed it doesn’t cause the headaches or reactions it was once blamed for. But it does contribute sodium, and if you’re watching your salt intake for blood pressure or heart health reasons, the higher sodium in Kewpie is worth noting. Tablespoon for tablespoon, you’re getting noticeably more salt than you would from Hellmann’s or Duke’s.
The Egg Yolk Difference
Most Western mayonnaise brands use whole eggs. Kewpie uses only egg yolks, about 3.6 yolks per 450-gram bottle. This is the main reason Kewpie tastes richer, creamier, and more savory than standard mayo. Nutritionally, egg yolks are denser in cholesterol, fat-soluble vitamins (A, D, E, K), and choline compared to whole eggs. But in the small amounts present in a serving of mayo, these differences are minimal.
The practical effect is flavor, not health. You might use less Kewpie than regular mayo because of its intensity, which could indirectly reduce your calorie intake. But the product itself isn’t nutritionally superior because of the yolk-only approach.
Fewer Preservatives, Simpler Ingredients
One genuine advantage of Kewpie is what it leaves out. Many conventional mayonnaise brands include calcium disodium EDTA, a synthetic preservative used to prevent the oils from going rancid and to stabilize the color. Kewpie’s ingredient list is shorter: vegetable oil, egg yolk, vinegar, salt, MSG, and mustard. No EDTA, no added sugar in most formulations, no artificial colors.
If your priority is eating fewer processed additives, Kewpie has a cleaner label. EDTA is considered safe at the levels used in food, but some people prefer to avoid synthetic preservatives when possible. This is a legitimate point in Kewpie’s favor, even if it doesn’t change the calorie or fat math.
Sugar and Carbohydrate Content
Kewpie contains 4.1 grams of carbohydrates per 100 grams, with 1.8 grams of that coming from sugars. Most regular mayonnaise has close to zero carbohydrates and sugar. The sugars in Kewpie likely come from the vinegar blend used in its recipe. Per tablespoon serving, the amount is trivial (roughly 0.3 grams of sugar), but if you follow a strict keto or zero-sugar diet, it’s a difference worth knowing about.
The Omega-6 Question
Both Kewpie and regular mayo rely heavily on soybean oil, which is high in omega-6 fatty acids. Research conducted with Kewpie’s own soybean oil-based mayonnaise found an omega-6 to omega-3 ratio of about 9.5 to 1. Most health organizations suggest a ratio closer to 4 to 1 or lower for optimal health. This isn’t unique to Kewpie; nearly all commercial mayonnaise made with soybean, sunflower, or corn oil has a similarly lopsided ratio. If this concerns you, mayonnaise made with avocado oil or olive oil offers a better fatty acid balance regardless of brand.
Kewpie’s Reduced-Fat Option
Kewpie does sell a “50% Reduced Fat” version that drops to about 82 calories and 8 grams of fat per serving, compared to roughly double that in the original. This brings it more in line with light mayo options from other brands. If you want the Kewpie flavor with fewer calories, the reduced-fat version delivers a meaningful cut. Just check the label, as reduced-fat products sometimes compensate with extra sugar or starch.
Which One Should You Buy
If you’re choosing between Kewpie and regular mayo purely for health reasons, neither one wins. They’re both high-calorie, high-fat condiments with similar nutritional profiles. Kewpie has a simpler ingredient list and no synthetic preservatives, but it also has more sodium and a small amount of added sugar. Regular mayo tends to be lower in salt but often includes EDTA and other additives.
The honest answer is that mayo choice matters far less than how much of it you use. A tablespoon of either product adds about 100 calories and 10 to 11 grams of fat. The differences between brands are marginal at typical serving sizes. Pick the one you enjoy, use it in reasonable amounts, and focus your health energy on choices that have a bigger impact on your overall diet.