If you end up at some fancy event this month where gold leaf decorates the food, that gold leaf will be far thicker than traditional Japanese hand-pounded gold leaf, which can be as thin as 0.0001 millimeters. See how it's made in the fascinating video.
The city of Kanazawa produces about 99% of Japan's gold leaves and the traditional methods are still widely used there. People beat gold into extremely thin sheets, so thin that it will disappear if you rub it with your fingers. The thinned gold leaves are then used for handicrafts, such as vessels and ornaments, or decoration. In some cases, chefs even use it as an ingredient for various types of foods!