Key Takeaway
Ramadan intermittent dry fasting affects circadian rhythms and alertness patterns but does not significantly impair cognitive function.
Summary
This study examined the physiological and psychological effects of Ramadan fasting, which involves abstaining from food and water during daylight hours (approximately 12-16 hours daily).
The researchers found that while fasting altered circadian rhythms and subjective alertness patterns, objective cognitive performance remained largely intact. Body temperature rhythms shifted, and evening alertness increased relative to morning alertness. These findings suggest the body adapts to intermittent dry fasting without significant cognitive impairment.
Methods
- Studied healthy Muslim volunteers during Ramadan
- Measured alertness, mood, and psychomotor performance
- Tracked oral temperature throughout day
- Compared to non-fasting control period
Key Results
- Circadian rhythm of body temperature shifted
- Subjective alertness patterns changed
- Objective cognitive performance maintained
- Evening performance relatively improved
- Adaptation occurred over fasting period
Limitations
- Observational design without randomization
- Confounded by sleep schedule changes
- Cultural and social factors during Ramadan
- Cannot separate food vs water restriction effects