/ck/ - Food & Cooking

>>15549374
Fast food doesn't "cook so fast" because of "density." It cooks fast because it comes pre-cooked, and they usually prepare a bunch of orders in advance, and fast food places have assembly line food construction down to a science such that even the laziest, dumbest teen can put together a burger in a couple seconds.
As for feeling hungry after, that's caused by the fact that fast foods are full of sugar and refined carbohydrates. After eating a big mac, you get a big bump in your insulin levels, which leads to a drop in your blood sugar levels. The end result is that this winds up making you feel hungry for more food.