In 2004 a study was done (1) that showed that lack of sleep for a short period of time saw an 18 percent decrease in leptin, a hormone that helps regulate the brains signaling for need of food, and a 28 percent increase in ghrelin, a hormone that triggers hunger. What this means is that in a very brief amount of time lack of sleep can do a big damage on fat loss efforts. Sleep loss seems to alter the ability of leptin and ghrelin to accurately signal caloric need and could lead to excessive calorie intake when food is all around. Add the chance of being hungry already due to a deficit and we get a final result that is not exactly optimal.
For the record, if you think just one night of no sleep is okay, think again. This recent 2008 study shows just one night of sleep affects hunger levels. (2)
To throw a different kind of log on the fire you have to look at the average decline of sleep in general over the past century. On average now adults are getting roughly 6 hours of sleep a night. We are seeing a decline in sleep and an increase in belt lines. While it is important to put so much of a focus on food this isn’t always the main issue at hand. Yes, overall calories do matter when it comes to fat loss. Sleep or no sleep, if you are eating in an excess little will matter. That being said, if you are set up to fail from get go, it is going to make this process that much harder.
One might want to argue that, again, the reason that the obesity problems are so out of control is due to the increase of carbohydrate intake over that same period of time. To this I want to point back to the original study (2004) in which that the 4 hr sleep folks wanted more candy and cookies and less dairy and meats. Why? When we lose sleep we increase hunger and decrease feeling of fullness and feed. However, we also increase cortisol and stress stimulation in the body. The main thing that blunts this in the body is carbohydrates. Since your body is pretty good, on average, of craving what it wants then it is going to lead you more to doughnuts and less towards the egg whites. The worst part is that lack of sleep decreases carbohydrate metabolism so you, again, are set up to fail. To point to a interesting side note it makes you wonder and think why Asia is starting to hop on board so fast with the obesity issues, being that a recent study showed there sleep has decreased by 2 hours a night on average. A country with already a very high carbohydrate diet is now suffering a worse fate. Could it be all that stress and lack of sleep isn’t helping?
I still blame Starbucks and McDonald’s myself.
My assignment to you:
1 week of sleep charting and accounting of your sleep habits.
I see so often people worrying about how many grams of starch carbs they are getting in a day, but neglect sleep. The goal is to try and get at least 7 hours of sleep at night (more is better) for 1 week. By the end of this I want you to share how you did putting an extra focus on how it affected your fat loss. Next Monday I am going to re-visit with you to see how it unfolds.
I am providing you with a PDF download I totally stole from some site off of goggle. I have no idea what they are selling or if they are. This is not a promotion for their product. I googled “sleep journal”, looked at a few, and thought this one was simple enough. I urge you to log even more than what this asks but I figured worst case you can print this off right now, and get going this evening.
http://faculty.washington.edu/chudler/pdf/sleepjj.pdf
Nite, nite.
1-http://www.annals.org/cgi/reprint/141/11/846.pdf
2-http://www.ncbi.nlm.nih.gov/pubmed/18564298
