S1983 - prison food/religion.
Denial of substitute meals during periods of fast substantially burdens Free Exercise of Religion.
No qualified immunity for denial of food.
http://media.ca7.uscourts.gov/cgi-bin/rssExec.pl?Submit=Display&Path=Y2016/D01-04/C:15-1928:J:Rovner:aut:T:fnOp:N:1681174:S:0
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.