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If you avoid fatty, fried, junk food, stop smoking
this will be the best you can do to prevent clogging. Eat plenty of fresh fruits and vegetables. Drink enough water. The bypass is needed because thick fat has gotten accumulated in the blood vessels supplying the heart which cannot be removed because much of the artery
is involved. No other go than surgery. You can consult at charitable association affiliated Hospitals or Government setup for subsidy in cost. But the surgery is essential to help in survival. Do not take it lightly. Your heart is getting less energy to work. Do not delay.