Background: Magnesium deficiency has been associated with type 2 diabetes and
may reduce insulin sensitivity and impair glucose tolerance. The etiology of
magnesium depletion in diabetes is unclear. Animal studies have suggested diabetes
may impair magnesium absorption, but there are no published studies in humans.
Objective: Magnesium absorption from a test meal, and its excretion and retention
were compared between type 2 diabetics and healthy controls.
Design: A meal labeled with 10 mg of 26Mg isotopic label was administered and
stools and urine collected for 10 and 6 days, respectively. Apparent absorption was
calculated as the difference between the oral dose of 26Mg isotopic label and the total
amount of isotopic label excreted in the feces. Magnesium retention was calculated
from the apparent absorption and the urinary excretion of 26Mg isotopic label in the 6
days after administration.
Results: Mean fractional magnesium absorption ±SD in the diabetic patients and
controls was 59.3 ±7.0 % and 57.6 ±8.5 %, respectively (N.S.). Mean urinary
magnesium excretion and mean magnesium retention ±SD in diabetics and controls
was 11.2 ±2.6 vs. 11.7 ±3.8, and 54.2 ±7.1 % vs. 51.4 ±6.1 %, respectively (N.S.).
Conclusions: Dietary magnesium absorption and retention are not impaired in
patients with reasonably well-controlled type 2 diabetes.
Background: Magnesium deficiency has been associated with type 2 diabetes andmay reduce insulin sensitivity and impair glucose tolerance. The etiology ofmagnesium depletion in diabetes is unclear. Animal studies have suggested diabetesmay impair magnesium absorption, but there are no published studies in humans.Objective: Magnesium absorption from a test meal, and its excretion and retentionwere compared between type 2 diabetics and healthy controls.Design: A meal labeled with 10 mg of 26Mg isotopic label was administered andstools and urine collected for 10 and 6 days, respectively. Apparent absorption wascalculated as the difference between the oral dose of 26Mg isotopic label and the totalamount of isotopic label excreted in the feces. Magnesium retention was calculatedfrom the apparent absorption and the urinary excretion of 26Mg isotopic label in the 6days after administration.Results: Mean fractional magnesium absorption ±SD in the diabetic patients andcontrols was 59.3 ±7.0 % and 57.6 ±8.5 %, respectively (N.S.). Mean urinarymagnesium excretion and mean magnesium retention ±SD in diabetics and controlswas 11.2 ±2.6 vs. 11.7 ±3.8, and 54.2 ±7.1 % vs. 51.4 ±6.1 %, respectively (N.S.).Conclusions: Dietary magnesium absorption and retention are not impaired inpatients with reasonably well-controlled type 2 diabetes.
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