Ghrelin is a hormone produced in our stomach that tells our brain when we're hungry. It's often referred to as the "hunger hormone" because when its levels rise, it makes us feel hungry and ready to eat. Full definition
The ones that drank the beverage that had 50 grams of whey in it experienced a significant reduction of ghrelin levels, which is one of the hormones regulating hunger, lasting for 4 hours. (fitnessandpower.com)
After the stress test, stress levels spiked and hunger levels rose slowly in all participants in both the morning and evening, but there were overall higher levels of ghrelin in the evening, suggesting that stress may impact this hunger hormone more in the evening than in daytime. (sciencedaily.com)
Studies have shown that when sleep is restricted, the hormone ghrelin increases and the hormone leptin decreases. (articles.chicagotribune.com)