Some centers allow eating, some don't.
Here is a thread that speaks to the issue. http://ihatedialysis.com/forum/index.php?topic=1129.msg14165#msg14165
Seems like they forget your human. There really is no compassion. It reminds me of that dialysis cartoon.... If there are any anarchists, maybe you should take a healthy sandwich and a bannana and just tell them, hey i'm going to eat one or the other...... you decide which one