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While most healthy Muslims are able to perform the fast without any major problems, as the month progresses the combination of lack of food and sleep can take its toll and a tired or grumpy Muslim colleague or school child can be found staring at the clock in the countdown to iftar time, when they can break their fast after sundown.
While missing out on business lunches and the daily mocca-chocca-skinny latte may be difficult, those with more physical jobs have an even more arduous task. Professional boxer Amir Khan fasts even throughout his training.
"Fasting makes you feel weak," he said last year. "You have to wake up at four or five in the morning to eat, but you're knackered and you don't feel like food, you have to force it down. I wouldn't fast on the day of a fight though."