Interactions between leptin, neuropeptide-Y and insulin with chronic diurnal fasting during Ramadan

Fasting during the month of Ramadan for Muslims is a unique metabolic model that includes abstinence from food and fluid intake during the period from dawn to sunset as well as a reduction in meal frequency and alterations in the sleep-wakefulness cycle. Leptin, neuropeptide-Y and insulin are though...

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Bibliographic Details
Published in:Annals of Saudi medicine 2004-09, Vol.24 (5), p.345-349
Main Authors: Kassab, Salah, Abdul-Ghaffar, Tarik, Nagalla, Das S, Sachdeva, Usha, Nayar, Usha
Format: Article
Language:English
Subjects:
Adolescent
Adult
Body Composition
Body Mass Index
Energy Intake
Fasting - blood
Female
Humans
Insulin - blood
Islam
Leptin - blood
Middle Aged
Neuropeptide Y - blood
Original
Time Factors
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Summary:Fasting during the month of Ramadan for Muslims is a unique metabolic model that includes abstinence from food and fluid intake during the period from dawn to sunset as well as a reduction in meal frequency and alterations in the sleep-wakefulness cycle. Leptin, neuropeptide-Y and insulin are thought to play an important role in long-term regulation of caloric intake and energy expenditure. However, the long-term changes and interactions between these factors during this pattern of fasting are not known. The study was conducted on 46 healthy female volunteers (age, 22+/-2 years; BMI, 25.3+/-0.7 kg/m2). Anthropometrical measurements, estimation of body fat and fasting serum levels of neuropeptide Y, leptin, insulin and glucose were estimated at baseline (day 1), days 14 and 28 of the month of Ramadan and 2 weeks after Ramadan. Baseline serum levels of leptin correlated positively with body fat (r=0.87, P=0.0002). Serum leptin levels exhibited a significant increase by approximately 41% and neuropeptide-Y levels were decreased by 30.4% throughout the month of Ramadan. In addition, a significant correlation (r=0.63, P=0.0001) was found between changes in serum leptin and serum insulin. However, changes in serum neuropeptide-Y levels did not correlate with those of leptin or insulin Long-term fasting with interrupted nocturnal eating is associated with significant elevations in serum leptin and insulin and reduction in serum neuropeptide-Y. The changes in serum leptin are likely mediated through insulin. However, changes in neuropeptide-Y appears to be mediated independently of leptin or insulin during this type of fasting
ISSN:0256-4947
0975-4466
DOI:10.5144/0256-4947.2004.345