HI
you can control progression of blockage and to some extent you can decrease amount of blockage
by life style modification
as your father is dibetic ,follow diabetic diet
your diet should be low fat ,high fibre diabetic diet
take good quntity of green leafy vegetables , avoid sweets , oily food , fried food item , egg yellow , backery product , ice cream ,fruit like banana , mango , custard apple , red meat ,organ like
liver ,
kidney brain etc
reduce weight till his BMI in between 20 to 25
good control of dibetes (sugar level) and blood pressure
regular walking
take medicine regularly
avoid any form of addiction (quit tobacco use in any form its must)
take care