There is one person who has kept a fast in space and it was Sultan bin Salman bin Abdulaziz Al Saud of Saudi Arabia. 

His Highness Sheikh Mohamed bin Zayed Al Nahyan, Crown Prince of Abu Dhabi and Deputy Supreme Commander of the UAE Armed Forces, in telephone calls, has exchanged greetings with a number of leaders on the occasion of Ramadan

H.H. Sheikh Saud bin Saqr Al Qasimi, Supreme Council Member and Ruler of Ras Al Khaimah, has offered heartfelt greetings and best wishes to President His Highness Sheikh Khalifa bin Zayed Al Nahyan on the advent of the Holy Month of Ramadan

H.H. Sheikh Saud bin Rashid Al Mu'alla, Supreme Council Member and Ruler of Umm Al Qaiwain, has offered heartfelt greetings and best wishes to President His Highness Sheikh Khalifa bin Zayed Al Nahyan on the advent of the Holy Month of Ramadan