alexa Metformin increases insulin sensitivity and plasma beta-endorphin in human subjects.
Nutrition

Nutrition

Journal of Nutrition & Food Sciences

Author(s): Ou HY, Cheng JT, Yu EH, Wu TJ

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Abstract Metformin has been widely used in clinical type 2 diabetes treatment and prevention. The present study was designed to explore the effect on people with a sedentary lifestyle at therapeutic doses. Twenty-two physically-inactive volunteers with normal glucose tolerance were studied. Escalating doses of metformin in low-dose (250 mg), intermediate-dose (500 mg), and high-dose (750 mg) treatment three times per day were administrated into each subject for a three-week treatment period. Fasting plasma glucose, A1C, HOMA-IR for insulin resistance, lipid profile, and plasma beta-endorphin-like immunoreactivity (BER) were measured before treatment and weekly at the end of each dosing period. Metformin significantly reduced fasting plasma glucose and HOMA-IR in healthy humans after receiving this treatment at therapeutic doses including low-dose (5 \%, 17 \%), intermediate-dose (6 \%, 25 \%) and high-dose treatment (6 \%, 21 \%). Plasma BER was also increased from 135.46 +/- 61.73 pg/ml to 137.52 +/- 66.11 pg/ml by low-dosing (p = 0.39), to 139.17 +/- 64.08 pg/ml by intermediate-dosing (p = 0.32), and to 149.59 +/- 63.32 pg/ml by high-dosing (p < 0.05). Also, serum cholesterol decreased significantly using metformin at therapeutic doses including low-dose (4 \%), intermediate-dose (8 \%) and high-dose treatment (7 \%). However, metformin failed to modify levels of serum HDL-cholesterol and C-reactive protein (CRP) in healthy subjects. Also, the reduction of serum cholesterol by metformin did not correlate to the increase in insulin sensitivity. In conclusion, metformin causes a significant parallel increase in insulin sensitivity and plasma beta-endorphin level in human subjects. This article was published in Horm Metab Res and referenced in Journal of Nutrition & Food Sciences

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