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There is no logical reason why the two should move together.
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well...
it could be related to the underlying causes of insulin resistance. Individuals with metabolic syndrome (believed to be the pre-cursor to type 2 diabetes), also have elevated blood pressure, a tendency to abdominal obesity, and elevated cholesterol.
the differentiation between LDL and total cholesterol is mostly irrelevant, as LDL level is generally proportional to total cholesterol anyway.
so.....
if Mosherman's HBA1c rise was caused by changes in insulin reistance it is logical that it would also cause his cholesterol to rise.
interestingly I have experienced increased insulin resistance this winter (judging by my increased insulin needs), and have also experienced a rise in cholesterol.
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Sugar scrapes the endothelial lining of artieries
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the believed mechanism of damage in diabetes has nothing to do with the shape of glucose molecules. It is believed that the mechanism is due to glycation of proteins.
Many proteins function are altered by the body adding glucose molecules to them. Usually this changes the shape of the protein molecule and causes it either become active or be deactivated. The mechanism acts as a form of molecular switch.
In general glucose quite readily sticks to protein molecules (this is actually what HBa1c measures). When it occurs outside of the body's control they are referred to as AGE's (advanced glycation end products). The body has an array of enzymes which mop up and neutralise these AGE's - in diabetes the excess production of AGE's exceeds the body's ability to neutralise them. They accumulate and damage body tissues.
One thread of research is looking at the role of AGE's in mitochondrial damage. Apparently glycation of mitochondrial enzymes is extremely hard for the body to reverse.
there are some problems with the theory of glycation of proteins causing the damage. While there is a relationship between a1c and development of complications, there is a high degree of variation between individuals with similar a1c's. I also remember reading that development of neuropathy does not fit well with A1c levels.