But our 15-hour daily eating windows disrupt the process, said Panda. They rob our bodies of the 12 to 16 hours we need to fully metabolize food and lapse into autophagy mode. Or, as the Cedars Sinai scientist put it, “If you eat…before bed, you’re not going to have any autophagy. That means you’re not going to take out the trash, so the cells begin to accumulate more and more debris.”