«This protein, however, works only within a certain time window, when the baby is still in the womb, so we have to administer it prenatally,» Schneider said. (health.com)
It's a way of eating (or rather not eating), where you restrict the consumption of your food to a certain time window. (siimland.com)
In my case that means limiting eating to a certain time window per day. (3fatchicks.com)