http://www.diabetes.org/tipoftheday.jsp?WTLPromo=HOME_tipoftheday&vms=279861238700
Question:
Where should I inject my regular insulin to get the most consistent
absorption?
Answer:
We recommend you use your abdomen. Insulin injected into the abdomen
is absorbed quickly and predictably so you know how it will affect
your blood glucose time after time. In general, there are three places
to inject insulin: the abdomen, the arms, and the legs. Several
factors affect the way your body absorbs insulin. If you exercise the
muscles of your arms or legs vigorously after an injection, more
insulin will be absorbed more quickly. It will be difficult for you to
predict how this insulin will affect your blood glucose. Warm
temperatures also increase the speed at which insulin is absorbed.
Because your abdomen is usually covered by clothing and stays warm,
insulin is absorbed more rapidly from this area.
Also check out "Ask The Expert":
http://www.diabetes.org/food-nutrition-lifestyle/lifestyle-prevention/ask-the-expert.jsp?WTLPromo=rtnav_101308
Kurt