Saturday, January 5, 2013

Vitamin D, PPAR-γ & the Growth of Healthy Body Fat Stores; Betaine & Fat Inflammation; Free HMB & Muscle Protection; DHA Induced Forgetfulness & Statistical Shenanigan

"Is it already 2013? Must be the DHA, I totally forgot."
The SuppVersity or rather my personal figure of the week was and still is 2013. I actually managed to write 2012 instead of 2013 with every damn study in today's installment of On Short Notice that has been published online in the last couple of days. I wonder how long it will take me to get used to it  - that's like a "new year's date jetlag" ;-)

Now, usually the figure of the week has at least something to do with the topics I am writing about, so I decided to add not another figure, but rather some stats, namely the TOP3 SuppVersity posts (by visitors) from the year that still appears to be programed into my system - 2012:
  1. "Particle Size & LCAT Analysis Shows: Three Whole Eggs per Day Improve Lipid Profile in Men & Women W/ MetSyn" (read more)
  2. "22g Baking Soda 60min Before a Old-School 4 x 12RM Leg Workout Allow for a 22 Rep Volume Increase on Hypertrophy Oriented Squat + Leg Press + Leg Extension Quads Routine" (read more)
  3. "Before, After or In-Between? Study Puts Another '?' Behind the Widely Accepted 'Cardio After Weights' Paradigm" (read more)
That's enough for the -12, let's get to the -13 now and take a look at this week's four On Short Notice items on Vitamin D, Betaine, HMB and DHA.

Study shows: Vitamin D helps your body with fat cell differentiation / maturation 

(Nimitphong. 2012) -- Those of you who have been around for a while will probably remember that I had the cheek to actually say that vitamin D3 could actually make you fat, not lean (suggested reads "Vitamin D3 a 'Fat Synthesizer'!?" "Stronger & Leaner of Fatter & Less Muscular w/ Vitamin D"). So in essence the results of the latest study by Nimitphong, MF Holick  et al. are not new (by the way, yep, this is the MF Holick whose brainchild 25-OHD actually is; cf. Holick. 1972):
Figure 1: 25(OH)D3 promotes the differentiation of human preadipocytes via PPAR-gamma and reduces the release of stored fat by blunting the lipoprotein lipase levels (Nimitphong. 2012)
"In contrast to its inhibitory effects in a mouse preadipocyte cell line, 3T3-L1, 1,25(OH)2D3 promoted adipogenesis in primary human preadipocytes as evidenced by the increased expression of adipogenic markers and lipid filling. In addition, we show that 25(OH)D3 can also promote the differentiation of human adipocytes, most likely via its activation to 1,25(OH)2D3. Furthermore, 1,25(OH)2D3 also had stimulatory effects on the differentiation of primary mouse preadipocytes. These results suggest that the local metabolism of vitamin D in adipose tissue may regulate the conversion of preadipocytes to adipocytes and hence support the healthy remodeling of human adipose tissue." (Nimitphong. 2012)
And while Holick is clever enough to bring the benefits of this "remodeling" to the forefront, we are dealing here with the exact same effects PPAR-gamma agonists have - not very surprising after all vitamin D3 turned out to be one (see figure 1). They allow the adipose tissue to expand "healthily", to allow to store more fat (and glucose after being converted to fat) without the negative health effects that occur, when the abundant energy is stored in existing adipocytes, until they burst from the seams.

Since I wanted to make this "short news", I will refer you to the red box in the Seabuckthorn post for further insights into the ambiguous effects of PPAR-gamma.

Betaine reduces inflammatory markers expressed by hypoxia (~suffocating) adipocytes

(Olli. 2013) -- You have read about the potential ergogenic effects of betaine aka trimethylglycine (TMG) at the SuppVersity, before. A a recent study from Finnish researchers does now suggest that it can also reduce the release of inflammatory cytokines and adipokines from hypoxic human adipocytes:
Betaine content (in mg/100g) of some common food items (based on Craig. 2004). You should also check some of your ready made supplements. More and more of the preworkout blends for example contain betaine.
"We show that betaine may reduce inflammation in adipose tissue in hypoxia and may therefore potentially help to reduce systemic inflammation and the risk for other obesity-related diseases." (Olli. 2013)
Usually this would be the point to say "Let's see what the real-world results are", but in this case previous epidemiological data has shown that free living healthy individuals
"[...] who consumed >360 mg/d of betaine had, on average, 10% lower concentrations of homocysteine, 19% lower concentrations of C-reactive protein, and 12% lower concentrations of tumor necrosis factor-α [TNF-alpha] than did those who consumed <260 mg/d." (Detopoulou. 2008)
Reason enough to take a look at the different TMG content of various foodstuffs in figure 1 don' you think so? And by the way, I will still keep you up-to-date as far as future developments in betaine research  are concerned (suggested reads: previous posts on betaine).

Free form HMB reduces acute muscle damage in previously resistant trained men

(Wilson. 2013) -- As far as the scientific background of the anti-catabolic effects of beta-Hydroxy-beta-methylbutyrate (HMB) is concerned There are a couple of promising long(er)term studies mostly in elderly individuals, there is the acute response study by Wilson et al. (result only a minor reduction in lactate dehydrogenase activity; Wilson. 2009) and since a couple of days, there is another acute supplementation study from Jacob M. Wilson et al. which differs from the previous one in terms of
    Do you remember Volcan's recently published Master Thesis (read more)? In his experiment he analyzed the effects of eccentric leg extensions + HMB supplementation. I wonder if the results would likewise have been statistically significant, if he had chosen the free acid form of HMB.
  • the subjects, now previously strength trained young men (21 years) instead of untrained subjects,
  • the measured parameters, now serum creatine kinase (CK), urinary 3-methylhistadine (3-MH),
    testosterone, cortisol and perceived recovery status (PRS), and
  • the form of HMB, now a free acid instead of the common calcium bound version of HMB
In this acute supplementation scenario, the replacement of the more common, yet slow absorbing 3g of CA-HMB (60-120min to peak plasma levels) with the faster absorbing free acid form (~30 min to peak plasma levels), was probably also the reason that the differences in post exercise creatine kinase levels (marker of skeletal muscle breakdown) did actually reach statistical significance in this "follow up study" (+329% in placebo vs. 104% in FA-HMB).

The notion that the consumption of 3g of FA-HMB can reduce skeletal muscle damage in trained individuals is supported by trend towards lower 3-MH / CK ratios (marker of protein breakdown) a significantly higher perceived recovery status (measured by questionnaires). There were yet no statistical significant differences in the post-exercise cortisol and testosterone responses. 

Does DHA make young women dumb? Or is it too much statistics that does?

(Beton. 2013) -- It sounds strange, but after receiving a 400mg DHA supplement (no EPA) for 50 days the 126 healthy young women who participated in a study that was conducted at the Department of Psychology of the University of Wales Swansea in the UK, were more likely to forget recently acquired information than their 133 peers who had received a soy + maize oil placebo. The scientists are not able to explain this phenomenon:
Figure 2:Took a hell lot of statistical shenanigan to "prove" the significance of the the results ;-)
"That there was a trend for more to be forgotten in both halves of the study supported the view that it was a genuine rather than a chance result, but naturally such a finding requires replication. The failure to find any difference in the ability to recall the names of capitals suggested that there was no problem in retrieving information from long-term memory stores; and so the finding must reflect some other aspect of the memory process. There is, however, in principle, no reason why n-3 fatty acid supplementation may not have both positive and negative influences. " (Benton. 2013)
In this particular study, the only "positive" thing about the DHA supplement, which contained DHASCO(R), a deodorised and bleached oil derived from the microalgae Crypthecodinium cohnii, was however that it did not have any (negative) effects on the other parameters the scientists measured, i.e. differences in mood, reaction times, vigilance or visual acuity. And if I am honest, I am pretty sure the "cognitive decline" is a null-result, as well - if it had real-world significance you would not need to "reanalyze" and "remerge" the data to finally get the one significant effect you'd like to have in any paper.

That's it for today, but as you all should know by now, there is always more on the SupppVersity Facebook Wall. Recent examples are
  • Thank god, scientists stop thinking like tortoises: "Generalisations such as 'live fast, die young' may be too simple to explain the complex processes affecting ageing and lifespan." (read more)
  • Korean cabbage kimchi increases nitric oxide production and suppresses inflammation in the aorta of apoE knockout mice, an atherosclerosis model (read more)
  • Sports concussions make you dumb: "A total of 27.7% of concussed student-athletes who were symptom-free and returned to baseline on ImPACT at rest exhibited cognitive decline following moderate physical exertion." (read more)
...and since it's (a) Saturday and (b) there are and will soon be more news, I hope you won't get bored within the next 24 hours it may well take for the next "official" SuppVersity post to be written and published.

  • Benton D, Donohoe RT, Clayton DE, Long SJ. Supplementation with DHA and the psychological functioning of young adults. Br J Nutr. 2013 Jan;109(1):155-61.
  • Detopoulou P, Panagiotakos DB, Antonopoulou S, Pitsavos C, Stefanadis C. Dietary choline and betaine intakes in relation to concentrations of inflammatory markers in healthy adults: the ATTICA study. Am J Clin Nutr. 2008 Feb;87(2):424-30.
  • Holick MF, DeLuca HF, Avioli LV. Isolation and identification of 25-hydroxycholecalciferol from human plasma. Arch Intern Med. 1972 Jan;129(1):56-61.
  • Nimitphong H, Holick MF, Fried SK, Lee MJ. 25-hydroxyvitamin d(3) and 1,25-dihydroxyvitamin d(3) promote the differentiation of human subcutaneous preadipocytes. PLoS One. 2012; 7(12):e52171.
  • Olli K, Lahtinen S, Rautonen N, Tiihonen K. Betaine reduces the expression of inflammatory adipokines caused by hypoxia in human adipocytes. Br J Nutr. 2013 Jan;109(1):43-9.
  • Wilson JM, Kim JS, Lee SR, Rathmacher JA, Dalmau B, Kingsley JD, Koch H, Manninen AH, Saadat R, Panton LB. Acute and timing effects of beta-hydroxy-beta-methylbutyrate (HMB) on indirect markers of skeletal muscle damage. Nutr Metab (Lond). 2009 Feb 4;6:6. doi: 10.1186/1743-7075-6-6.
  • Wilson JM, Lowery RP, Joy JM, Walters JA, Baier SM, Fuller JC, Stout JR, Norton LE, Sikorski EM, Wilson SM, Duncan NM, Zanchi NE, Rathmacher J. β-Hydroxy-β-methylbutyrate free acid reduces markers of exercise-induced muscle damage and improves recovery in resistance-trained men. Br J Nutr. 2013 Jan 3:1-7.