http://www.mendosa.com/gi.htm
this is the link to a glycemic index site good info about 15 pages to pring or is it 20 some where along that line but good info to print out. explains alot about it.
40 - 30 - 30 is lower that most but still higher. there is no real right or wrong when trying low carb. many people do diferent levels of lowcarb. but it usually has to do with the quality of the carbs that makes the difference. the low glycemic index foods are better as they have less of an initial im[pact onthe insulin spike when eaten. such as a slice of white bread will spike your insulin levels within the firsh hour to a certain level but whole wheat bread will spike it lower and the reason that is better is that your body does not get that huge release of insulin flowing around the bloodstream which causes the problems.
hopw that helps the site does expalin ti better.