Quote:
Originally Posted by simplchaos
That's how I've always viewed it. Then I read the IP papers and they say exercise burns our muscle mass instead of building it. I wish I could just lose with exercise because this diet thing and all it's stipulations confuse me.
This is a simplistic, and not totally accurate, picture. It's designed to scare you out of exercising so that you lose optimal weight for the clinic's statistical record.
The reality is that vigorous exercise breaks down muscle fibers. This happens to everyone, including body builders. Ever notice that no professional athletes trains every day at the same intensity level? This isn't accidental, it's a deliberate program designed to allow them recovery workouts and rebuilding.
There are many stages to the body's fueling program, from ensuring that you have sufficiently high blood glucose level (ie your carb loading is done at the front end of exercise) so that you have no need for your body to break down muscle as a fuel, other than general wear and tear (stress) on the muscle fibers. Then you have recovery. In order for the body to synthesise protein it needs an insulin release, which is triggered by carbs. This is why we add in the extra packet AFTER the workout. Another acknowledged fact is that the body continues to burn calories at an increased rate for many hours AFTER exercise is completed, especially strength training rather than cardio.
Here is an excellent article about the muscle composition and how it is used by the body during physical exertion.
Protein is the building block for muscle. Not just the whey, soy, vegetable proteins and meats & fish that we are eating as part of the IP diet, but also the amino acids - google Branched Chain Amino Acids for more information. Put simply, if you are just doing your hardcore exercise without understanding what your body needs then you will be doing yourself a disservice on a calorically/carb restricted diet. You may lose weight quickly in the early days, but it will be at the expense of your metabolism as your muscle and lean mass declines.
The standard advice in weight loss is that around 20-25% of loss will be lean, as opposed to fat mass. The reality is that you can reduce that to around 5-10% with smart fueling/refueling while exercising.
As always, the results people get from exercising are hugely variable. The more in tune you are with your body's responses to any external stimuli the faster you will be able to add exercise in and do it without detriment to your weight loss and body composition.
