It’s not fasting if you gorge yourself when the sun isn’t up. Some gain weight during Ramadan. Like you say weird.
Pig out all night. Look pathetic during daylight hours for lack of food and water. I've observed the behavior first hand with a customer team that included a muslim. It certainly trashes productivity at work during daylight hours.
I’m a Live and Let Live kind of guy, but if any Allah Snackbar types want to mess with anyone practicing Ash Wednesday rites, I support turning their heads into ashes.