People with diabetes can have foot problems because of poor circulation and nerve damage (known as diabetic peripheral neuropathy). Before you begin a walking program, ask your doctor: • To check your feet for nerve damage. Such damage can leave you unable to feel a blister or cut, putting you at risk for infection or wound-healing problems. • To evaluate your gait. Diabetes can cause joint damage and changes in the shape of the foot that may affect how you walk. You may need a shoe insert (an orthosis) to compensate for changes. • How a fitness routine may affect your medication and diet. Exercise can lower glucose levels for up to 24 hours, so you might need to alter what you eat to prevent blood sugar from dipping too low.