I've always wanted to do this. Not because of any one else, but for me, and for the Lord. I've always believed it would help my body to be in shape (not that it isn't) and to be in more tune for what God has for me. To keep myself healthy, alive, and fresh, able to do the Lord's will. I do believe also that it's okay to eat what you eat. As long as you glorify God with what you eat. And I don't believe God condemns any of it. (Not unless it's something weird like eating monkey's, dead corpse, and etc...)
But sometimes you just want to do what is greater for yourself, and to do more for God. And in this case, I believe this is the better cause, for me at least. It reminds me of scripture when Paul talks about having a wife, and not having one. That both is good, but one of the option is more than good, it's greater. That option would be, not to have a wife. Because you'll do more for God, and you'll be concerned of the things of God. While a man with a wife, cares about taking care of his wife, and the things of his wife. It reminds me of this scripture because of it's same principle that applies, but rather than on a wife. It's on food.
It's good that you do eat, and glorify God with your food. And your festival as brothers and sisters. But how much more better it is to glorify God while taking care of your body, physically?