Facial muscles drooping due to diabetes is a complication of long term diabetes which has reached the stage of nerve damage. “Nerves are damaged because glucose isn’t metabolized normally and because the blood supply is inadequate”. (Page 790, The Merck Manual of Medical Information).
As I mentioned previously, nerve damage can be corrected and damaged nerves can rejuvinate and regenerate rather quickly, from two weeks to six-nine months. A completely liquid diet without dairy may help nerves regenerate. Blood with a low blood sugar content and blood with a low fat content have a higher blood oxygen transport capacity. This capacity has a lot to do with the health of the nerves and thus their regeneration.