The fear is that the insulin shots will reudince insulin sensitiivyt and lead to diabetes. However, at least 2 things differ between the typie sufferer of type II diabetes and a BB'er using it:
-Pancreatic insulin output is less in the BB'er injecting insuline
-THe athlete has a great deal of muscle mass and is physically active, which improve insulin sensitivity.
Consider that even using Hum R , twice daily, you will have 16 hrs and at least 2 -3 good meals / day where the pancreas must produce insulin on it own (assuming 4 hr for each of 2 insulin shots). Assume you're bulking, this may mean more insulin output than compared to a dieting condition.
Type II (adult onset) diabetes, is complex, but generally considered to result (in many cases) from a cluster of diseases often called metabolic syndrome, obesity, being the main culprit.
The downward spiral is one of overweight/ overfat leading to insulin resistance, which leads to a greater insulin requiremenbt by the pancrease. This in turn leads to greater fat deposition and the cycle continues untill the pancrease is unable to keep up and the person's insulin resistance is severe enought to be considered diabetes.
BB'ers / atheltes using insulin for muscle growth are so far from this chain of events that is seems unlikely that they would become diabetic (as I note above.)
Sean, if you're really concerned, you can buy a glucometer at the pharmacy and take a resting blood glucose level and even do a fasted glucose tolerance test to see if you're within normal limits. Not the same as in a doc's office, but damn close.
-Randy