some people say its necessary, and some say it'll just make you fat. from everything i've read it makes me believe it'd make you fat, but its an interesting question. i wish i could help more...all i can say is that it is probably more beneficial on training days and your almost definately more sensitive, do a search on insulin you'll find scords of good articles...i just picked up some humulin-r the other day and some 28g pins, i read up and plan on starting sometime this week, i'll only do it once a month for about a week, just to give myself a little benefit...too scared to use it more regularly..be careful and good luck
dj