[redrummr]

Fasting != intermittent fasting. You're not abstaining for weeks.

A meal can take take 24 hours or longer to digest (especially when it's a 'feast').

It's not unusual for people to gain weight during Ramadan (they don't break their' fast' with green pea soup).

If it's your first day (of your life) adjusting your food intake pattern, maybe there is a performance hit.

I'm not Muslim but I fast for fitness reasons much of the year. More focus, more strength, euphoria.

Eating takes a lot of energy. I now work for myself but when I was at a multinational finance company, I could see the post-lunch drain bring down 90% of people on my floor.

I would be worried about the pilot that ate three slices of pizza before getting on the plane!