The SV trend.

Employees at San Francisco startup Nootrobox don’t eat on Tuesdays.

The weekly fast isn’t an extreme money-saving move by a scrappy, bootstrapping company. Instead, Nootrobox team members swear withholding food for 36 hours — they stop eating Monday night — improves their workplace focus and concentration.

“We’re actually super productive on Tuesdays,” co-founder and CEO Geoffrey Woo said. “It’s hard at first, but we literally adopted it as part of the company culture.”