“Today, instead of experiencing a mellow and graceful transition to sleepiness during the evening hours, our exposure to artificial light after sunset kicks off a chain reaction of adverse hormonal events. Artificial light and digital stimulation after dark suppress the release of melatonin, the hormone that makes us feel sleepy in the evening (a process known as dim light melatonin onset, or DLMO). In tandem, we experience a spike in the primary stress hormone cortisol. Initially, cortisol floods the bloodstream with glucose, giving us a ‘second wind’ to stay awake and finish our emails or Netflix series binge.”
Thus, if you stress yourself in this manner every night, chronically elevated evening cortisol can bind with the appetite receptors in the brain and trigger you to consume high-calorie foods. Late nights also dysregulate ghrelin (spiking appetite) and leptin (promoting fat storage). Indeed, our digestive systems also have a circadian rhythm, and eating late at night can mess things up…making it likely that you’ll eat beyond feeling satisfied and store those calories as fat.”
Mark Sisson is the founder of Mark’s Daily Apple, godfather to the Primal food and lifestyle movement, and the New York Times bestselling author of The Keto Reset Diet. His latest book is Keto for Life, where he discusses how he combines the keto diet with a Primal lifestyle for optimal health and longevity. Mark is the author of numerous other books as well, including The Primal Blueprint, which was credited with turbocharging the growth of the primal/paleo movement back in 2009. After spending three decades researching and educating folks on why food is the key component to achieving and maintaining optimal wellness, Mark launched Primal Kitchen, a real-food company that creates Primal/paleo, keto, and Whole30-friendly kitchen staples.