Works well for some people, I've heard.
"A good nutritionist has MANY tools in his arsenal. There are just way too many different situations, individual metabolisms, etc. to try to think everyone can fit into the same mold. I may not use the exact ideas of "carb-backloading" and "intermittent fasting" as they are popularly known today (and by the way, diet fads come and go) but the general principles are there and have their use at certain times with certain people. ."-Shelby Starnes
That's about the whole science of any of it. Much of what gets passed off as the "perfect answer" is part of a much more complete system being used for a specific athlete or practitioner. I personally feel that a good diet log and workout log would help everyone figure out about 95% of the issues with their training.