FB, I don't know what you mean about being a "serious cutter". I also don't understand what you mean about refeeds doing harm in the long run, or what bodybuilding benefits you think are going on here.
The clearest example I can give you is for Targeted Ketogenic Dieting, or TKD. There's a lot more about this in the exercise forum.
For TKD, you basically live in Atkins land, except for lifting days. On these days, shortly before training, you take in an amount of pure dextrose that your body will use up for lifting, and then have it out of your system so it doesn't do you any harm. The harm in having high blood sugar comes from not using it up right away.
For me, this is about 40g. So, 40g dextrose, I go to the gym and have a great lifting workout, then to make sure I don't have any leftover excess blood sugar, I make sure I burn it off with some moderate cardio so it's all gone and I get back into nice, healthy ketosis as quickly as possible. Basic harm reduction strategy, maximum positive (muscle gain, fat burning) with minimal negative health benefits (very short period of time out of ketosis).
Now, suppose I do the same thing with brown rice. The problem with this lower GI carb is it enters my blood stream more slowly. If I have it half an hour before I lift, I don't have ALL of it available for my lifting, where it's going to HELP my body, and I've still got it IN my sytem, digesting, long after I've finished my cardio, so it spills over into my fat stores, raises my triglycerides, and makes me fatter.
If I have it several HOURS before I lift, I'm out of ketosis during that entire time, but I don't have a nice, strong supply of blood sugar that is REALLY well used while lifting intensely. Either way, I can't build muscle as well, and I can't burn fat as well.
You can argue your philosophy all you like. I'm simply stating the facts.
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