Have we laid that to bed for good? nailed the coffin shut? Gave it the old heave ho once and for all?

Haven't seen or heard anyone bring it up in ages. (thankfully)

Anyone still holding onto that belief or any coaches still preaching that?

metabolic efficiency is obviously a real thing

Since both you guys believe in it and I can find no scientific research backing it other than eating a higher fat diet to burn more fat at all intensities, and that Seehobar and Matt to my knowledge have no scientific evidence and in light of these two research pieces (One by Burke who has probably done more research on it than any other researcher and was a HUGE proponent of it for close to a decade) can you guys point to the research that Fitzgerald et al are using. I've never gotten a response from any coach that I've asked for the research other than a FU ahole (actually I've gotten that 2x). I'm not saying this doesn't exist or won't be discovered x or xx yrs from now, I'm saying there is no research proving it does exist or is true.

Here's summaries saying it's much to do about nothing if you guys can point me to the stuff they are using that says opposite I'd love to read it.

http://www.ncbi.nlm.nih.gov/...articles/PMC4008806/
http://jap.physiology.org/content/100/1/7

I feel it was the flavor of the day stuff designed to milk people, er sell coaching.

Have we laid that to bed for good? nailed the coffin shut? Gave it the old heave ho once and for all?

Haven't seen or heard anyone bring it up in ages. (thankfully)

Anyone still holding onto that belief or any coaches still preaching that?

I think a higher fat, not a restrictive no carb diet, can be healthy and has health benefits that have nothing to do with sports performance

That I can agree with.

I'm strictly speaking from a performance standpoint, from say working out a % FTP in order to become more efficient or running at pace X or Y in order to perform better bc you'll teach you body to utilize a greater % of fat. That sort of thing.

Dr. Tamsin Lewis was recently on IM Talk discussing this topic and some of the recent research as I recall. Again, I think people confuse this term "metabolic efficiency" or "high fat" diets with the ketosis nut jobs who eat less then 200g of carbohydrate a day and call it healthy. I certainly don't think it's healthy at all or conducive to quality training. I think a balanced diet is better although I do think a lot of A'ers eat way to much sugar based carbohydrate while training and recovering.

Not dead in Dallas. My old coach that I've talked with you about in the past still advocates training at easy efforts based on HR to build "metabolic efficiency." I still get weekly team emails reminding people not to go too hard on long rides and runs because then they won't build metabolic efficiency. He's never advocated diet changes or pointed to research. He's gotten several people (including myself) to 70.3 worlds now by pushing that emphasis so people still listen.

Not dead in Dallas. My old coach that I've talked with you about in the past still advocates training at easy efforts based on HR to build "metabolic efficiency." I still get weekly team emails reminding people not to go too hard on long rides and runs because then they won't build metabolic efficiency. He's never advocated diet changes or pointed to research. He's gotten several people (including myself) to 70.3 worlds now by pushing that emphasis so people still listen.

During the days of eating a high-fat diet, I reached a fat-burning rate of 1.2 grams per minute at Ironman pace, confirming the theory that a high-fat diet shifts your body’s reliance on fat for fuel, but my rate shifted back down to 0.8 grams per minute after two days of carbo loading. It seemed the protocol had no effect on me.

I began to implement them back in 2007, and at first I could scarcely go for one-and-a-half hours before I bonked. But as my body adapted, I was able to ride three, four or five hours on water alone. This approach has a big effect in activating the genes that stimulate the production of enzymes involved in fat oxidation, as shown in a 2005 study by L.J Cluberton et al. In other words, the water-only rides might be the reason my ability to burn fat was already so high when I did the periodized diet experiment.

My scientific team and I tested the water-only approach and found that during these rides, I would burn fat at a rate of 1.2 grams per minute—similar to the fat burning rate I achieved after high-fat eating on my periodization diet. This indicated that the training stimuli of the water-only rides were the same as those in a high-fat diet. Plus, these rides were far more practical and didn’t sacrifice my ability to do intense workouts and properly digest my food.

Have we laid that to bed for good? nailed the coffin shut? Gave it the old heave ho once and for all?

Haven't seen or heard anyone bring it up in ages. (thankfully)

Anyone still holding onto that belief or any coaches still preaching that?

I've never gotten a response from any coach that I've asked for the research other than a FU ahole (actually I've gotten that 2x).

I feel it was the flavor of the day stuff designed to milk people, er sell coaching.