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Effect of Ramadan fasting on some indices of insulin resistance and components of the metabolic syndrome in healthy male adults

  • Z. Vahdat Shariatpanahi (a1), M. Vahdat Shariatpanahi (a2), S. Shahbazi (a3), A. Hossaini (a4) and A. Abadi (a5)
  • DOI:
  • Published online: 01 July 2008

The purpose of the present study was to evaluate the effect of Ramadan fasting on insulin sensitivity in subjects with the metabolic syndrome. Males (n 55; age 34·1 (sd 8·9) years) with the metabolic syndrome were studied. Blood pressure, waist circumference, body weight, HDL-cholesterol (HDL-C), TAG, fasting plasma glucose (FPG), fasting blood insulin and insulin resistance indices (quantitative insulin sensitivity check index (QUICKI), homeostasis model assessment of insulin resistance (HOMA-IR) and reciprocal index of HOMA-IR (1/HOMA-IR)) were evaluated before and after 30 d of Ramadan fasting (two meals at 12 h intervals). The dietary intake was estimated by 24 h recall before and after fasting. The total daily energy intake was decreased by 234·6 (sd 88·2) kJ/d in the fasting period (P = 0·005). 1/HOMA-IR, QUICKI and HDL-C were significantly increased (P = 0·005, P = 0·001 and P = 0·004) and FPG significantly decreased (P < 0·005) after fasting. Simple linear regression analysis demonstrated that HOMA-IR, 1/HOMA-IR and QUICKI were related to waist circumference after intervention (r 0·458, P < 0·001; r − 0·396, P < 0·05; r − 0·342, P < 0·05). In conclusion, the present study showed that the combined change in the number and timing of meals and portioning of the entire intake into only two meals per d may increase insulin sensitivity in subjects with the metabolic syndrome even when the decrease in energy consumption is minimal.

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*Corresponding author: Dr Z. Vahdat Shariatpanahi, fax+98 21 22600714, email
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British Journal of Nutrition
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