Eating, drinking, sexual relations are not what I would consider being unhealthy and certainly not contemptible (despicable). I do believe doing this for good old fasting reasons makes sense.
Prayers and good deeds offered to God on the last days of Ramadan are THOUGHT to be worth 700 times more than prayers offered other times. Wow.... Sounds like some of the ideas I was taught from the religion I grew up in.
Heck, if Muslims believe that, it seems they wouldn't have any problem buying into the Christian Gospel message, which is to believe in the Lord Jesus and you will be saved, especially since the Jews were responsible for His crucifixion.