Mayonnaise is a beloved, creamy condiment, but not all mayos are created equal. The healthiness of this popular spread depends heavily on its ingredients and preparation method. While a homemade version with high-quality oil and fresh eggs can be a source of healthy fats, most store-bought varieties contain components that are less beneficial for health. Understanding the specific parts of mayonnaise that can be detrimental is crucial for making informed dietary decisions.
The Problematic Ingredients in Commercial Mayonnaise
Inflammatory Seed Oils
For many health-conscious consumers, the biggest red flag in commercial mayonnaise is the type of oil used. The majority of mainstream brands are made with cheap, refined vegetable oils, such as soybean, canola, sunflower, and corn oil. These oils are high in omega-6 polyunsaturated fatty acids (PUFAs). While omega-6 fatty acids are essential, a typical modern diet often contains an excess of them compared to anti-inflammatory omega-3 fatty acids. This imbalance can lead to chronic inflammation, a known contributor to various health problems, including heart disease and obesity. The processing of these oils, involving chemical and high-temperature heating, can further damage them, making them inflammatory and harder for the body to process.
High Calorie and Fat Density
Even when made with healthier oils, mayonnaise is a calorie-dense condiment due to its high-fat content. A single tablespoon of regular mayonnaise can contain around 90 calories and about 10 grams of fat. For those who consume it generously, these calories can add up quickly, contributing to weight gain. The ease with which it can be added to sandwiches, salads, and dips often leads to an unnoticed increase in daily caloric intake. While fats are essential for a healthy diet, excessive consumption can easily disrupt calorie goals, especially when paired with other calorie-rich foods like burgers and fries.
Hidden Sugars, Sodium, and Preservatives
Beyond the oil, many commercial mayonnaise brands add ingredients that compromise their nutritional value.
- Added Sugars: To improve flavor and texture, some brands include added sugars like high fructose corn syrup. For instance, Miracle Whip is known for its added sugars. This contributes to blood sugar spikes and can raise the risk of developing diabetes over time.
 - High Sodium Content: Mayonnaise can be high in sodium, with some brands exceeding 80mg per tablespoon, which can contribute to high blood pressure, especially for those sensitive to salt.
 - Chemical Additives and Preservatives: Shelf-stable mayonnaise relies on additives and preservatives like EDTA to extend its shelf life. While deemed safe in small quantities, some people report side effects like headaches and nausea. Many additives and flavor enhancers, including MSG disguised as "natural flavors," are best avoided for optimal health.
 
Food Safety Concerns
While less of a concern with commercial mayonnaise due to the use of pasteurized eggs, food safety remains a potential issue, particularly with homemade versions. Homemade mayo made with raw eggs carries a risk of Salmonella contamination if not prepared and stored correctly. Although store-bought varieties are safer, improper handling, such as leaving it out of refrigeration for too long, can also lead to bacterial growth and foodborne illness.
Commercial vs. Homemade Mayonnaise: A Nutritional Comparison
Making your own mayonnaise at home gives you complete control over the ingredients, allowing you to create a much healthier version free from undesirable oils, sugars, and preservatives.
| Feature | Commercial Mayonnaise | Homemade Mayonnaise | 
|---|---|---|
| Oil Quality | Typically cheap, refined seed oils (soybean, canola), high in inflammatory omega-6s. | Can be made with healthy oils (olive, avocado), providing beneficial monounsaturated fats. | 
| Additives | Often contains chemical preservatives (EDTA), thickeners, and flavorings. | No artificial additives; only natural, whole-food ingredients. | 
| Added Sugar | Some brands add sugar or high fructose corn syrup for taste. | You control the sweetener, often using none or a small amount of a natural alternative. | 
| Food Safety | Uses pasteurized eggs, minimizing Salmonella risk, but still requires proper refrigeration. | Uses raw or pasteurized eggs; requires caution with raw eggs but can be safer with pasteurized ones. | 
| Nutrient Density | Nutrient-poor, contributing mostly empty calories. | Can be nutrient-rich depending on ingredients, providing vitamins E and K and choline from eggs. | 
Making Healthier Mayonnaise Choices
To mitigate the unhealthy aspects of mayonnaise, consider these tips:
- Choose Wisely: Read ingredient labels carefully. Opt for brands made with healthier oils like avocado, olive, or coconut oil. Some brands may list a healthy oil on the front but still contain seed oils in the ingredients list, so always double-check.
 - Try Homemade: Making your own mayo is surprisingly simple and allows for full control over the ingredients. A basic recipe includes eggs, a healthy oil, vinegar or lemon juice, and seasonings. For safety, especially if serving vulnerable populations, use pasteurized eggs or follow a recipe that cooks the eggs slightly.
 - Consider Alternatives: For a creamier texture with fewer calories and fat, consider healthier alternatives. Greek yogurt, hummus, or mashed avocado can provide a similar feel while offering more nutrients and less fat.
 - Practice Portion Control: Even with healthier versions, moderation is key. Use just enough to add flavor and creaminess without drowning your food. A standard serving is just one tablespoon.
 
Conclusion: The Verdict on Unhealthy Mayonnaise
So, what part of mayonnaise is unhealthy? Primarily, it's the cheap, inflammatory seed oils, high caloric density, and artificial additives found in many commercial brands. While homemade mayonnaise made with quality ingredients can be a healthier choice, the store-bought variety can contribute to inflammation, weight gain, and other health issues if consumed in excess. By being mindful of ingredients, controlling portion sizes, and considering healthier alternatives, you can enjoy mayonnaise without compromising your health goals.
For a delicious and healthier homemade mayonnaise recipe, visit a site like Downshiftology for inspiration.