Your mixer is adjusted for optimum mixing at the factory, but through time and use, it can change, and it should be readjusted. CLICK HERE for a video showing how to adjust the beater to bowl clearance. To which I said "if I should be concerned KitchenAid would have a memo and a recall notice, and I wouldn't learn this information from some random woman on Facebook" I then searched "lead KitchenAid" and all the articles about it were from mommy bloggers all quoting one "study" from a person titled "LeadFreeMommy" or something like that.