Why is there increase in urination in diabetes mellitus?

Answer 1

Diabetes mellitus is an inadequate secretion of insulin, causing blood sugar levels to rise. Excess glucose remains in the nephron creating an osmotic pressure that opposes the norm. Therefore water also remains in the nephron and is not absorbed.

-Patients of diabetes mellitus ofen suffer from large amounts of urine and are often thirsty.

Answer 2

In case of diabetes II patients, the glucose, which is now in excess, in the body, leaks into the kidneys. This makes a greater concentration of glucose in the kidneys. In order to make this glucose move out, the kidney draws water from adjoining tissues and organs. This is useful in allowing excess glucose to be excreted until the blood glucose in the body becomes normal. But it leaves the body dehydrated. so it is better to keep drinking lots of water because dehydration can be bad for kidneys.

Answer 3

1. Diabetics retain water to offset the extra sugar in their system
2. There is a point (Near 10 mg sugar to liter of blood) where the body enters "spill over" where the body dumps fluid to get rid of excess sugar.

Both these things cause the diabetic to be thirsty and drink large amounts of liquid, thus urine production increases.

In short the reason why diabetic people make a lot of urine and become thirsty is because glucose leaks into their urine which 'pulls out' extra water through the kidneys.