It's for a similar reason, lets assume you are working on a 30~ minute task and you order food that will also arrive in 30 minutes. For the next 20 minutes you

It's for a similar reason, lets assume you are working on a 30~ minute task and you order food that will also arrive in 30 minutes. For the next 20 minutes you work extremely hard and finish your task, and you are now suddenly EXTREMELY hungry. Your brain being a normal brain makes the logical jump "my task took 30 minutes, food must be here soon" checking your position re-assures your brain that you just worked quickly. There are other reasons [ie: I have a 10 minute task, check to see if that can be finished before delivery] but I agree they don't add anything