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blaenau gwent and merthyr county boroughs have the highest number of circulatory diseases , caused by a diet rich in saturated fats , smoking and high blood pressure
ym mwrdeistrefi sirol blaenau gwent a merthyr tudful y mae'r nifer uchaf o glefydau cylchrediad y gwaed , a achosir gan ymborth sydd yn cynnwys llawer o frasterau dirlawn , ysmygu a phwysedd gwaed uchel
