Is this Diabetic insurable?

Is this 44 year old male insulin dependent diabetic insurable? He is six feet tall and weighs 160 pounds; he was diagnosed six years ago; he has been prescribed insulin three times a day; one unit per 15 grams of carbs and seven units before bedtime. Otherwise he is in good health.

Guardian underwriter's response:

"44 male with Type 1 DM..
50%, 5 year BP no other benefits... If there has been good control and no residual effects from the DM"