I would be interested to see the body of research on the effects of Ramadan (1 month of fasting, both food and liquid until sunset) on the health of those who f

I would be interested to see the body of research on the effects of Ramadan (1 month of fasting, both food and liquid until sunset) on the health of those who fast. The effects on the economy were clear from what I observed in Afghanistan - at least 5% potential GDP loss due to reduced working hours, shutdown of public services, overall latency of business transactions during this time. An actual study across different observing countries would be intriguing.