effects of ramadan fasting on spirometric values and clinical symptoms in asthmatic patients

introduction: ramadan is the 9th  islamic lunar month during which muslims avoid eating and drinking from sunrise to sunset.  the effect of ramadan intermittent fasting on asthma control is controversial.  the aim of this study was to investigate the effects of ramadan fasting on the spirometric variables and clinical symptoms on well-controlled asthmatic patients during ramadan. material and methods: a cohort study was conducted in mashhad, khorasan razavi, iran. twenty-nine (19 females and 10 males) well-controlled asthmatic patients aged 47 (12) years completed the study.  the average duration of fasting was 26.5 days. assessment of spirometric variables (daily peak expiratory flow, peak expiratory flow variability, peak expiratory flow home monitoring ) as well as asthma clinical symptoms including dyspnea, cough, wheezing, and chest tightness were carried out. results: no significant changes in clinical symptoms were reported in asthmatic patients at the end of ramadan fasting.  among spirometric variables, only peak expiratory flow improved after ramadan (p <0.05).  there was a reduction in the mean peak expiratory flow variability from 13% at the first week of fasting to 10% at the fourth week (p <0.05).  conclusion: in well-controlled asthmatic patients, ramadan fasting resulted in improvement in peak expiratory flow and peak expiratory flow variability.