New Study: Lack of a Full Night's Sleep Can Make You Fat

Excel Male

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"Disturbed sleep resulted in a 27 percent average decrease in insulin secretion after eating, and higher glucose levels over a longer period of time, sometimes high enough to make the subject prediabetic. In addition, there was an average 8 percent decrease in resting metabolism rate, a measure of how much energy the body consumes at rest, that translates into a theoretical weight gain of more than 12 pounds a year."


Previous studies also linked interrupted or poor sleep to higher cortisol blood levels, which was thought to explain some of the weight gain. It has also been speculated that those who keep late hours to go to sleep tend to overeat at night. But this study actually measured insulin response and blood sugar in those who had interrupted sleep and saw a dramatic decrease in insulin's effectiveness at controlling blood sugar.


So, to keep from gaining weight, it is not only important to eat healthy and exercise, but to try to get a full night sleep every night.
 
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Understanding Your Hormones

Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

DHT

Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

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The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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