|Fans of Homer Simpson knew it all along: Abdominal hypertrophy = brain atrophy.|
Sneak Peak #2 - SuppVersity Science Round-Up: DHEA Special! I hope you are not mad at Carl and me for not broadcasting the Science Round-Up last week. We will do our best to make it happen today - so make sure you tune in in time for the live(!) show at 12PM EST, if you have any interest in DHEA for performance, longevity, general and metabolic health and improvements in body composition.As you can see in figure 1, it is - just as usual - not the BMI that determines the risk of brain-atrophy, but the location and tissue type where the extra-weight is stored.
|Figure 1: Association between anthropometric variables and magnetic resonance imaging markers of brain aging; the association with Brain infarcts was not found to be statistically significant (Debette. 2013)|
"The present study, showing a strong inverse association between anthropometric markers of central adiposity and total brain volume, provides further evidence that abdominal fat distribution may be a more powerful predictor of structural brain aging than global body mass, and extends thesefindings to a larger sample of 1779 older persons (mean age 73 years) in the community." (Debette. 2013)Being abdominally obese is however not the only risk factor for being subject to brain shrinkage. The international team of researchers was also able to confirm a significant association with a certain gene type in women. In view of the fact that this does not change that it's being / getting obese that triggers the brain atrophy, I am yet not willing to waste another word on the "it's not your fault" *bs* - you are not a victim of faulty genes! If anything, you are a victim of flawed information and nutritional advice... but I am digressing.
If we discard the genes, what are the underlying causes?
|If you don't want your brain to shrivel away before you are in a coffin six feet under, I suggest you don't miss this post: "Restore & Maintain Insulin Sensitivity - Basics: Turn Your Lifestyle Upside Down" | learn more|
These improvements may be downstream effects of the amelioration of the currently heralded triggers of gray matter volume reductions:
- insulin resistance and
- adipose-tissue derived hormones, such as leptin
Apropos, I did not list it with primary suspects, but actually research by Canessa, et al. (2011), Carnell, et al. (2012) and Morrell, et al. (2010) appears to suggest that sleep apnea, which happens to be correlated with inflammation, insulin resistance and an overabundance of leptin and is about as rampant (yet rarely diagnosed, as obesity) could turn out to be heavily involved in the etiology of brain shrinking, as well.
Did you know that DHEA is suspected to be the earliest trigger of brain neuronal remodeling in adolescents (Blakemore. 2010) No? Well, maybe this is not the only thing you should know about DHEA, so listen to the Science Round-Up, today!Bottom line: If you are stupid enough to let your waist line expand only 0.5cm every year, you better get accustomed to the idea that your brain will be shriveling away faster than your skin. Moreover, this process appears to start early in life, as a study Gunstad et al. who observed similar trends in health individuals from a much broader age spectrum (17-79y) appears to suggest.
And last but not least, a 2005 study by Enzinger et al. confirms that increased HbA1c levels and thus, as Debette et al. suspect insulin resistance and diabetes are likewise significantly associated with an increased risk of brain atrophy.
So in case you haven't done so already, I suggest you read both the information about lifestyle modifications and supplements to improve and maintain insulin resistance.
- Blakemore SJ, Burnett S, Dahl RE. The role of puberty in the developing adolescent brain. Hum Brain Mapp. 2010 Jun;31(6):926-33.
- Canessa N, Castronovo V, Cappa SF, Aloia MS, Marelli S, Falini A, Alemanno F, Ferini-Strambi L. Obstructive sleep apnea: brain structural changes and neurocognitive function before and after treatment. Am J Respir Crit Care Med. 2011 May 15;183(10):1419-26.
- Carnell S, Gibson C, Benson L, Ochner CN, Geliebter A. Neuroimaging and obesity: current knowledge and future directions. Obes Rev. 2012 Jan;13(1):43-56.
- Colman RJ, Anderson RM, Johnson SC, Kastman EK, Kosmatka KJ, Beasley TM, Allison DB, Cruzen C, Simmons HA, Kemnitz JW, Weindruch R. Caloric restriction delays disease onset and mortality in rhesus monkeys. Science. 2009 Jul 10;325(5937):201-4.
- ebette S, Wolf C, Lambert JC, Crivello F, Soumaré A, Zhu YC, Schilling S, Dufouil C, Mazoyer B, Amouyel P, Tzourio C, Elbaz A. Abdominal obesity and lower gray matter volume: a Mendelian randomization study. Neurobiol Aging. 2013 Aug 31. [ahead of print]
- Enzinger C, Fazekas F, Matthews PM, Ropele S, Schmidt H, Smith S, Schmidt R. Risk factors for progression of brain atrophy in aging: six-year follow-up of normal subjects. Neurology. 2005 May 24;64(10):1704-11.
- Gunstad J, Paul RH, Cohen RA, Tate DF, Spitznagel MB, Grieve S, Gordon E. Relationship between body mass index and brain volume in healthy adults. Int J Neurosci. 2008 Nov;118(11):1582-93.