BCAA raise insulin to a high degree. So if you take them pre training during a fasted workout session, would you not shut of the very process increased fat burning you are trying to achieve by fasted training by raising insulin? If insulin is high (BCAA on a fasted stomach), fat burning machinery shuts down, right?
Accordingly, if you take BCAA after a fasted training session, with the intent to fast a bit longer to continue the fat burning process, wouldn't the same problem arise?
Furthermore, instead of carb loading whenever you decide to break the fast post training, you wish to eat a meat-fat vlc meal, wouldn't the increased insulin levels cause more fat storage of the ingested fat?
asked byanimaleater (2422)
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on November 19, 2012
at 03:36 AM
The difference comes with the type of Insulin response. BCAA's will stimulate acute Insulin response from the turning on or beginning of protein synthesis. Unlike a heavy carbohydrate or carbohydrate + protein meal, BCAA's will not cause a lasting Insulin response. When you ingest Glucose, for instance, the Insulin response is both acute and long-lasting, as there is an initial response by the Pancreas and then a continual response to the blood until the blood Glucose gets back to a normal. Now, it's a lot more complicated than this and obviously depending what is consumed can greatly change this response, but the latter, chronic Insulin release is why the typical metabolically deranged person will develop Type II Diabetes and other issues.
To answer your specific question, I think BCAA's before "fasted" cardio is an interesting debate. I think the arguments can be made on both sides, both on the "inhibits fat burning" and "spares muscle tissue" side of the fence. In my opinion, I am a big fan of the use of BCAA's, but I do agree that Physiologically it DOES inhibit some metabolizing of stored fatty acids. Here's my implementation...
If I'm someone with a great deal of muscle mass and I'm concerned about preserving this, I'd tend to use the BCAA's and just be content with even 25% of my fat burning ability.
If I'm someone with a great deal of fat to lose, you have to accept that much of your "functional muscle" you develop just to support the excess fat is going to be lost while burning fat. If fat loss is your goal, roll with that, don't worry about BCAA's and just do straight up fasted cardio.
Everyone should be using BCAA's in supplement form or those found in Whey Protein (or both together) post-workout. No doubt about that.