So, I can go to a nice place and get some freshly made mayonnaise with my crab cakes.  It&#x27;s tasty as f, and is clearly unhealthy.  If it&#x27;s made with bad ingredients or bad hygiene there is a risk of food poisoning - raw eggs and all that.  Each chef makes the mayonnaise with slightly different seasoning and those tablespoon&#x2F; half a lemon etc measures vary a bit from batch to batch.<p>Alternatively I can have a cheeseburger at Maccy Ds.  I am confident that there&#x27;s no real risk of food poisoning from the faux mayonnaise in the filling.  The McMayo makeup is accurately detailed to within % points.  It&#x27;s jammed full of various preservatives, and indeed it can probably be stored for years without risk.<p>McMayo is safer, has detailed nutritional info, and is perfectly consistent.<p>Personally - I&#x27;ll have the fresh mayonnaise every time, and strangely not knowing the amount of saturated fats doesn&#x27;t trouble me in the slightest.  To each their own.