When sugar levels in the blood remain high, damage can occur in the tiniest of the blood vessels transporting oxygen to tissues. These tiny arteries or arterioles become scarred and clogged with cholesterol’ containing plaque. The damage in such cases is widespread throughout the body, with virtually all tissues receiving less than adequate supplies of blood and oxygen. This chronic oxygen deficit to the heart muscle can lead to gradual, insidious damage to the heart which may not be detected until the heart’s function is severely impaired.
Diabetes adversely affects the cardiovascular system indirectly by impeding blood pressure control and restricting heart rate. That happens
when nerve damage leads to improper regulation of blood pressure and pulse rates, preventing the nerves from controlling those functions when the body requires them to speed up or slow down.
Normally the least effort results in some change in blood pressure and heart rate. Even getting up from a chair is enough to set the heart beating a bit faster in normal individuals. But without such fine-tuning, blood has a tendency to pool, blood pressure is abnormally low, and the individual has a tendency to faint.
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Cardio & Blood/ Cholesterol

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