Final answer:
Ketosis is not a direct cause of increased infection risk in diabetics; it is a result of excessive fat metabolism. Poor circulation, hyperglycemia, and weakened immune function are the factors that contribute to higher infection rates.
Step-by-step explanation:
The question asks which of the following is not a reason diabetics are prone to infections. The correct answer to this question is ketosis. While poor circulation, hyperglycemia, and a weakened immune function can all make diabetics more susceptible to infections, ketosis itself is not directly responsible for increased infection risk. It is a condition that can arise from high levels of ketone bodies due to excessive fat metabolism, often due to an absence or insufficient level of insulin in the body during diabetes, particularly type 1 diabetes. However, it's the high blood sugar levels (hyperglycemia) and the resulting immune suppression that primarily contribute to the increased infection risk, not the ketosis state directly.