The Great Calorie Debate -- A YOUNG biophysicist weighs in
Hat tip to Colby Vorland (@nutsci) via Twitter: New fuel for the calorie debate
This is the blog of one Carson Chow -- half of the dynamic duo who set one Mr. Gary Taubes straight for once and for all about glycerol-3-phosphate -- and routinely puts the man to shame. Oh ... but let it never escape your mind that Chow is *young* ... I hear he's even more *young* than I am *female*!!
In any case, Chow picked up on something that I missed in my obsession with the statistics. The average TEE's measured by doubly labeled water were: LF / LGI / LC = 2812 / 2937 / 3137 (by FQ) and = 2767 / 2926 / 3013 (by RQ). The average caloric intake was 2626 calories per day. This was less than each of the average TEE's for each diet by either measure. By a minimum of 140 calories per day, to over 500 calories per day. On average, everyone would have been in caloric deficit and lost something over 12 weeks, yet they didn't lose weight. Heck, I suppose that's something for the CDS sufferers to hang their hats on. Chow seems to attribute this more to error in TEE measurement, and I'll add that cheating cannot be ruled out either.
Oh ... interestingly enough, they reported energy intake as is customary, Mean (SD) -- 2626(686). But no such transparency for EE's which are reported Mean [95% CI Range]. Sigh.
And oh again ... re-reading, it was the other half, (rumor has it he's still young too), Kevin Hall, that picked up on this.
Comments
Hall really hit on something embarrassing for the authors of this study. They didn't notice that the measured TEE exceeded the reported intake by as much as 500 cal/day. This was measured over 2 weeks. If this were true, it would be reflected in weight. Speaking of which, the margin of error in the weights is 4.1 lbs = ~9 lbs which is 4.5% of their mean weight and roughly 1/3rd of the mean weight loss. Were they weight stable??? We can't tell that from the data presented but they mentioned that intake would not be altered in the test phases regardless of fluctuations in weight, so did they? I'm beginning to think that they didn't construct a proper data table because it wouldn't make for good optics.
This study is more and more horrible the more I think about it. And lost in all of this is how little it means even if it had been perfect in every other way. They looked at short term maintenance on diets that differed from the diet used to lose weight to make recommendations for the best maintenance diet because recidivism rates are so high for obesity. So now the LC'ers will claim in their books that you have a higher metabolic rate on low carb. That explains why it's so much easier for low carbers to maintain their weights, eh?
http://www.nytimes.com/2012/05/15/science/a-mathematical-challenge-to-obesity.html?_r=1&ref=science
Chow's age is interesting, he likely looks younger and this betrays Taubes' biases. Taubes almost always refers to Hall & Chow as the two YOUNG biophysicists. In his lectures he quotes tens of scientists by name but in Q&A's and interviews he refers to scientists he's spoken to by descriptives -- which is why I used to call Keith Frayn the English guy, that's who he was for several months. These two may look 20 years or perhaps more his junior, but that SHOULD be irrelevant. Taubes mentions their supposed youth to diminish them. In one interview (I've listened to a lot recently) he said "two bioph... two young biophysicists" ... it's important to him that his audience associate youth with these two. This is done to plant the seed in his audience's minds that they lack experience or perhaps even knowledge. That Chow is not even a decade his junior is quite interesting indeed.
Signed, (formerly) anonymous female blogger
What I take home from this is the obvious; there is a "metabolic advantage" in terms of greater energy loss through heat generation on VLC diets.
Whether this is really an "advantage" in weight loss terms - why it should differ from energy lost by exercise or fasting - no-one knows.
I like to think thus (which is honestly the way most of our hypotheses should be phrased in our current state of knowledge): the real "advantage" from VLC comes through a pharmacological effect of ketones on metabolically damaged neurons.
If you have this damage, you benefit from ketosis, at least up the point where the damage is reliably reversed.
You can nitpick absolutely any experiment for size, duration; these things are expensive and hard for participants to sustain. This is as good as it gets at the moment, and better than most. The difficulty of conducting a study as one would have liked should never be taken as license to interpret the results as one would have liked them to be.
I and most others will give you this: ketosis can and generally does suppress appetite for a good long time. But some do not even experience a transient suppression of appetite. Really! And if we're talking long term, a 4 week study period when longer studies have been conducted makes this pretty useless. Right? Or am I just nit picking?
But eh ... this is really the BEST we can do? No it's not.
stuff into a stocking. You can find inexpensive ice pop molds by the dozen at the dollar store, big box, or houseware store.
I'm usually very successful but this year is proving to be a bit more difficult.
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