As it turns out, mayonnaise is actually a good source of healthy fats. That may sound crazy but look at what it is made of. Mayonnaise is made from an uncooked egg yolk, some lightly flavored olive oil, grape seed oil or avocado oil, some mustard, red wine or apple cider vinegar, lime juice and a pinch of sea salt. All healthy ingredients, by the way.
Now for a couple of important and, hopefully, interesting facts.
Mayonnaise is made thick by emulsifying the oil and the egg yolk. This is important because the bile of your gallbladder actually emulsifies fats. Emulsification is the process of making lipid (fatty acid) molecules more accessible to your body. It is like predigesting some of the most important nutrients in your diet.
Also, a raw egg yolk is of significant medical benefit to your health where a cooked egg yolk is an actual burden to your liver. A raw egg yolk contains lecithin, which is very good for your liver, gall bladder and your brain, but once it is cooked solid, the lecithin is destroyed.
Also, once the yolk is cooked, the cholesterol becomes oxidized and becomes a higher risk factor in the development of arteriosclerosis.
So, there it is, Mayo is medicine.