French fries are typically crisp, hot, and salty. This is a triple-threat that signals the tongue and the brain to eat more, Mashru says. The fat content in French fries triggers receptors in our mouths that send a signal to our brain and gut reinforcing the desire to eat more. “These little potato sticks are also a comfort food,” Mashru says. “Therefore, every time you go through the line in a restaurant and see them on the menu, you may find the urge to order them as a side to your entrée irresistible.