Public Service Announcement: Calling all Low-carb, Low-fat and Veg*n advocates.

Cont'd from The cause of America's rising obesity rate is irrelevant. The cure for it is what's important.

While you're rearranging the deckchairs by squabbling over which diet is best...

From http://www.britishtitanicsociety.com/titanic-story-gallery/tragedy/

People are getting fatter and sicker in increasing numbers around the world, due to increasing numbers of people eating a diet based on crap-in-a-bag/box/bottle. Would switching back to a diet based on whole, minimally-processed produce not be an improvement?

So, why don't you all agree to say the same thing, like:-

Base your diet on whole, minimally-processed produce, rather than products. Tweak it to suit.

While you're wasting time shouting each other down, the manufacturers of crap-in-a-bag/box/bottle are laughing all the way to the bank. :-/

Cont'd on Free will? It's just an illusion! How the Food Product Industry gets people to dance to their tune, part 1.

When bad science goes...pretty much the same!

After the previous post, you may have got the impression that things are getting worse. Hmmm!

From http://covermyfb.com/covers/27316/say%2Csee+and+hear+no+evil

Hat-tip to James Beckerman, MD for https://twitter.com/jamesbeckerman/status/507544419847786496, which refers to Comparison of Named Diet Programs Finds Little Difference in Weight Loss Outcomes.

This study comes to the opposite conclusion of the study in my previous blog post. As that study was a pile of poo, that must mean that this study is 100% correct, right? Hmmm!

Your enemy's enemy is not necessarily your friend. See What about the Other Weight Loss Diet Study??
"Previous meta-analyses, such as Hession et al, had balanced inclusion criteria that allow us to directly compare low-fat to low-carb diets.  They reported exactly what anyone would expect who is familiar with the weight loss diet literature:

1. At 6 months, low-carb diets consistently lead to greater weight loss than low-fat diets. 
2. At one year, the difference has all but disappeared. 
3. Neither diet produces particularly impressive weight loss at one year or more.
4. The weight loss effectiveness of typical low-fat diets tends to be modest at all time points.

Oh, well. It could have been a lot worse!
 

When good science goes bad, part n+1.

In When good science goes bad , I looked at the effect of funding bias on research.

From https://www.youtube.com/watch?v=sJ5jbxMjexo

Effects of Low-Carbohydrate and Low-Fat Diets: A Randomized Trial has just been published. As expected, low-carbers are positively creaming themselves over it. I instantly smelled a rat, as the full study was behind a pay-wall.

Remembering Krauss' shenanigans with "carbohydrate", consisting of 50% sugars + 50% "complex" carbs (maltodextrin & amylopectin are complex carbs that hydrolyse into glucose so rapidly that they have a GI of 100 on the "Glucose=100" scale.), I suspected dodgy carbs in the "Low-fat" group.

Luckily, David L. Katz, MD, MPH, FACPM, FACP had read the full study, and wrote about it in Diet Research, Stuck in the Stone Age.

As I suspected, it was another "fix-up" job, rigged to make low-carb diets look good, and low-fat diets look bad.

See also:-
Low-carbohydrate vs. Low-fat diets for Weight Loss: New Evidence,
What I Learned By Actually Reading That Low-Carb Is Best Study,
Is low-carb really the best weight loss diet? and
A Question about the latest diet study ...

How low-carbohydrate diets are (incorrectly) explained to work.

Having explained how low-carbohydrate diets work, here are a few ways in which they don't work.

Uh, nope!

1. Hormonal clogs: This is a term used by Jonathan Bailor. I don't think he's referring to wooden shoes! The "clog", I'm guessing, is supposedly caused by that dastardly hormone insulin. Uh, nope!

See the following plots of RER vs exercise intensity after being on high-fat diet or low-fat diet.

RER = 0.7 ≡ 100%E from fat. RER ≥ 1.0 ≡ 100%E from carb.

The low-fat diet results in higher RER, so the body is burning a higher %E from carb and a lower %E from fat.

However, this doesn't make any difference to weight loss, as it's merely a substrate utilisation issue. In addition, when the body is burning a higher %E from carb, this depletes muscle glycogen stores faster, which lowers RER during the course of the exercise. So, it's not a problem.


2. Insulin: This is Gary Taubes' hypothesis. Insulin makes your body store carbohydrates as body fat. Uh, nope!

The only time that there's significant hepatic DNL is when there's chronic carbohydrate over-feeding. If you eat sensibly, there's no significant hepatic DNL.


3. A Calorie isn't a Calorie, where weight change is concerned: This is Richard D Feinman's hypothesis. "A calorie is a calorie" violates the second law of thermodynamics, therefore there's a metabolic advantage with low-carbohydrate diets. Uh, nope!

Where to start? Evelyn Kocur knows her Physics, so I'll start there. See The first law of thermodynamics (Part 1) and The first law of thermodynamics (Part 2).

From Second Law of Thermodynamics:-
"Living organisms are often mistakenly believed to defy the Second Law because they are able to increase their level of organization. To correct this misinterpretation, one must refer simply to the definition of systems and boundaries. A living organism is an open system, able to exchange both matter and energy with its environment."

People on ketogenic diets excrete very few kcals as ketone bodies. See STUDIES IN KETONE BODY EXCRETION. There is no significant Metabolic Advantage with low-carbohydrate diets.