Take glucose in the serum as an example. Every cell in the body needs a continuing supply of glucose to stay alive. The burning of glucose with oxygen is your main supply of energy, so the level of glucose in the blood must remain within very strict limits. If it falls too low, you become faint and weak as your muscles and brain start to fail.
However, if the blood glucose level rises too high, as it does in poorly controlled diabetes, the blood becomes measurably stickier, and thickens. This is a problem for people with diabetes, who are at higher than normal risk of angina if they do not control their glucose levels very closely for this and other reasons.
A raised glucose level, however, is a very minor change compared to a rise in blood fat levels, or if the platelets become “stickier.” Even a small rise in fats—mainly measured as cholesterol—can make the blood much more viscous, and when this is combined with clumps (or aggregates) of platelets floating in the bloodstream in the smallest arteries, it can greatly reduce the smooth and easy flow of blood through them. These are changes that can happen to all of us, not just to diabetics, and that we can do much to reverse. If we let them continue, on the other hand, we are inviting the conditions for angina to develop.
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