Ghrelin, Leptin, and Sleep
The reason why we tend to gravitate to the pastries the day following a short night sleep is a hormonal response. The two hormones responsible for this are ghrelin and leptin. Ghrelin stimulates appetite while leptin produces a feeling of fullness.(1) When you get a shortened night of sleep, levels of ghrelin increase while levels leptin decrease.(1,2,3) Studies have shown that individuals with habitual sleep of 5 hours compared to those of 8 hours had 14.9% higher ghrelin levels and 15.5% lower leptin levels.(2) This creates a double dose of food cravings matched up with the feeling of being less satisfied after eating. What can be worse than having a strong craving for a donut, not feeling satisfied after eating it, and knowing that you had just blown your diet.
Consistently get a full nights sleep to lose weight
Studies show that there is a trend between lack of sleep and obesity.(2,3) The effect of ghrelin and leptin driving sleep-deprived individuals to eat starchy, high calorie foods can make people feel incapable of losing weight. The key to many individual’s weight loss success can lie in getting a full 8 hours of sleep every night. The difference in being well rested will allow you to make better choices in nutrition and enable you to have the energy for a great workout.
So the next time you consider staying up late for unnecessary activities, (i.e.: watching tv, browsing the internet, interacting in social media, nights out with friends), think of how you will feel the next day. In addition to being tired, you are more likely to eat that quick pastry for breakfast, heavy comfort food for lunch, and skip your workout. Getting consistent, adequate rest takes discipline and planning just like working out and eating right.
For expert personal training and fitness knowledge contact Jerry Yuhara, CPT,PES
Photo by Chris Schmich
1. Cholette Bouchez (January 1, 2007) The Dream Diet: Losing Weight While You Sleep WebMD Retrieved from http://www.webmd.com/sleep-disorders/guide/lose-weight-while-sleeping?page=3
2. Taheri S, Lin L, Austin D, Young T, Mignot E (2004) Short Sleep Duration Is Associated with Reduced Leptin, Elevated Ghrelin, and Increased Body Mass Index. PLoS Med 1(3): e62. Retrieved from http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.0010062
3. Patricia Prinz (December 7, 2004) Sleep Appetite and Obesity – What’s the link? PLoS Med Retrieved from http://www.ncbi.nlm.nih.gov/pmc/articles/PMC535424/