INS and congenital muscular dystrophy due to LMNA mutation: Glucose, HOMA-IR and HbA1c decreased while insulin levels increased in all three groups. Changes in glucose, insulin and HOMA-IR levels were similar among groups. The reduction in HbA1c levels was significantly greater for patients allocated to the LCMD and TMD groups, compared with patients on the LFD (p = 0.021).