Anyone know what study this comes from?
I'm listening (oh it is torture folks!) to Dayspring & Taubes in the Specialty Health series on YouTube. In the second video, Fat One, around 10:40 mark for context, Taubes says that a research group from UConn (Volek I presume) did a study that showed that you'll have more saturated fat in your bloodstream if you eat a high carb diet than if you eat saturated fats. Anyone know what study he's referring to, and if this is indeed true? Thanks!
Also, so I don't waste an entire post on just this, let me throw out another topic for discussion. If sat fat is good for you and you need some of it (if you go back to around the 10 min mark you'll get this whole thing for context) ... why is high carb bad? Your body makes "pure" sat fats out of the excesses it chooses to do so with.
Our bodies make sat fats, cholesterol and glucose ... why is only the glucose bad in the mind of the low carber, or to be fair, sat fats & cholesterol to the low fatter?
Comments
http://dl.dropbox.com/u/37202414/Volek_ProgLipidRes_2008.pdf
Dietary carbohydrate restriction induces a unique metabolic state positively affecting atherogenic dyslipidemia, fatty acid partitioning, and metabolic syndrome
http://rdfeinman.wordpress.com/2012/02/22/saturated-fat-on-your-plate-or-in-your-blood/
You can't look at diets without considering the gut microbiota. However this concept is largely ignored by the LC crowd.
-M Scott
'Our results point to a suitable diet that had an emphasis on low carbohydrate
foods with fat sources emphasizing MUFA and n-3 PUFA (e.g., omega-3 eggs, avocado, salmon, sardines, meat, poultry, olive oil, canola oil, nuts and seeds) although there was little if any detriment in a higher saturated fat approach.'
http://www.ncbi.nlm.nih.gov/pubmed/20820932
See Lucas Tafur for the more nuanced version of blog blog's anserine comment.
"In fact, reducing bacterial variety, to restore a better bunch of microbes later, is one of the benefits of LCHF, and one of the reasons that the path to safe starches often needs to run through ketosis."
A LCHF merely changes the ratio of bacterioides and firmuctes present in the gut. A diet cannot eliminate many harmful bacteria such as C. difficle because they form spores which can persist for decades. As soon as simple carbohydrates are reintroduced to the diet the original inflammtory microbiota will re-establish within a few days.
A diet high in fruit and vegetables and low in refined carbohydrates will work far more effectively than a LCHF diet in reducing inflammation. This is because a high fibre diet will simultaneously suppress (inflammatory) firmicutes and promote (anti-inflammatory) bacteroiodes. A LCHF diet simply reduces overall bacteria counts without significantly changing the ratio of pro-inflamatory and anti-inflammatory species.
Starches are not particularly effective in restoring a healthy microbiota because they tend to encourage indiscriminate growth of bacteria.
My qualifications:
BAppSci (Food technology/Biotechnology)
MSc(Hons)Biotechnology (a PhD programme entry qualification).
GCertSci(HMS) [exercise science]
Lipids is a low impact factor journal.
http://link.springer.com/article/10.1007/s11745-007-3132-7/fulltext.html
"Total saturated fatty acids and 16:1n-7 were consistently decreased following the VLCKD."
And the whole study is pointless since the low carb group lost more weight. Silly.
"Composition of the experimental diets was developed using nutrient analysis software consisting of normal foods that differed only in the relative amount of saturated and unsaturated fatty acids, but were matched for food type, energy, total fat, dietary fiber, trans fat, and cholesterol"
"Predominant foods in the CRD-SFA were high-fat dairy (cream, butter, cheese, and low-carbohydrate milk), eggs, meat, poultry, and white fish, and a few low omega-3 nuts and seeds (such as almonds). In the CRD-UFA, predominant foods were liquid omega-3 PUFA eggs (Egg Creations, Burnbrae Farms Ltd, ON, Canada. Containing EPA, DPA and DHA), hard shell omega-3 eggs (high in ALA and DHA), salmon, sardines, meat, poultry, olive oil, canola oil, low-fat low-carbohydrate dairy, walnuts, and seeds. "
Substantiate your claims, brother!
'Predominant foods in the CRD-SFA were high-fat dairy (cream, butter, cheese, and low-carbohydrate milk), eggs, meat, poultry, and white fish, and a few low omega-3 nuts and seeds (such as almonds)..."
If you read the paper you will find the diets are ad lib and uncontrolled. The participants were merely counselled on what to eat. They were not provifded with food.
"extraordinary claims require exttraordinary evidence". The LFHC people are making the extraordinary claims that contradict a vast body of evidence dating back over 60 years.
It is very apparent that most of the studies supporting LCHF are poor quality papers that been cherry-picked from relatively obscure journals. A balanced review of the literature doesn't provide the same results.
"Limited effect of dietary saturated fat on plasma saturated fat in the context of a low carbohydrate diet."
This is the one you called junk and where you claimed that the participants weren't given any actual food. My correction of you is regarding that study. These people were given actual food and asked not to eat anything else.
"Comparison of Low Fat and Low Carbohydrate Diets on Circulating Fatty Acid Composition and Markers of Inflammation"
In this study they were only counselled what to eat and, as I already stated, the low carbers lost more weight.
Blogblog -- I very much enjoy a "clean" comment section without lots of deleted posts. Everyone double posts or changes their mind from time to time, but I've had to put far more of your deletions to spam in the past few days than I've had to over the past year! I even have word recognition off at the moment as Google has become increasingly difficult with their challenges so there should not be issues of duplicates and such. Also, while I enjoy tangential discussions, from which new blogging often flows, I don't see how your injection of gut microflora is in any way relevant here. Please folks (and this goes out to both bb & those challenging him) don't turn my comments section into a platform for arguments that have originated elsewhere.
You have two UConn studies. Did either of those show that you have more saturated fat in your bloodstream eating high-carb than if you eat saturated fats?
What did I miss, reading the studies? Did the people who ate low-fat (I'm guessing that equates to 'high carb' here) end up having more saturated fatty acids in serum?
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