Kumar said:
I am not thinking about "renal glycosuria" as it is another disorder.
Good, good, something seems to have been understood....
Kumar said:
But I am thinking about lesser total loss of sugar in urine. It may be due to kidney is absorbing more OR sugar is in low concentration in urine OR there is less total secretion of urine. I mean if total loss of sugar is lesser than normal/needed per day? This may cause high level of glucose in blood.
Think a bit harder. It is not a
decrease in the renal glucose threshold which will cause a decrease in the total loss of glucose on the urine, it is an
increase. And yes, I believe this sometimes happens in long-term diabetics, but as I said it's not something I know much detail about.
There is no apparent effect on the blood glucose concentration. All the experience we have in dealing with diabetic patients indicates that blood glucose concentration is in practical terms unaffected by the amount of glucose lost in the urine. However, it does mean that the body is losing less energy, the patient is not dehydrated or polydipsic, and the risk of urinary tract infection is less.
Get over it, Kumar. Glycosuria is an incidental finding in diabetes, and of no metabolic consequence. Handy for diagnostic purposes (or it once was), and a nuisance because of causing the thirst and the cystitis, but not important otherwise.
Remember, normal urine glucose is (in practical terms) zero. So you can't possibly decrease urine glucose in a normal individual. When blood glucose concentration increases to greater than the renal threshold, glycosuria will occur. The only way to alter this is by getting the blood glucose back down, or if the renal glucose threshold happens to rise. But it's only important because of the side effects. In terms of the main issue of diabetic control, it's the
blood glucose that matters, and the only way you will decrease that is by the usual methods of treating diabetes. How much glucose you might (or might not) lose in the urine doesn't affect it.
Kumar said:
Yes naturally, hyperglycemia can cause more urine secretion, concentrated urine for sugar & probably low absorption by kidneys per day. It will also encourage thirst( polydipsia) which can be needed for excess secretion of urine per day & avoid dehydration.
Good, so far somebody might even have been listening.....
Kumar said:
Is it not a natural mechanism to control hyperglycemia?
NO!!!! How many times do I have to tell you? It doesn't make a blind bit of difference to hyperglycaemia. It's an unavoidable side-effect of the way the kidney works, that's all.
Kumar said:
Btw, how do you calculate renal threshold for sugar.
You perform a glucose tolerance test, collecting urine samples every 30 minutes or so during the test.
Kumar said:
I am also thinking about relation of hyperinsulinemia+ hyperglycemia due to IR with total sugar loss in urine. Can hyperinsulinemia effect renal re-absorption, amount of total urine or sugar concentration in urine resulting in lesser total loss of sugar per day and hyperglycemia?
Whether these roles of insulin indicate, hyperinsulinemia causes more absorption of glucose, fatty acids and amino acids in intestines and lesser loss of sugar in urine?
I'm going home.
Rolfe.