Expert Answer:
this should work
names = {'Health', 'Practice', 'Taste', 'Test'};
for iName = 1:numel(names)
for iFile=1:21
origName = sprintf('FoodS0%d%sSession1.mat', iFile, names{iName});
newName = sprintf('Food%d%sSession1.mat', iFile+109, names{iName});
movefile(origName, newName);
end
end
untested but should be more or less it. Edit: make the %d without leading zero and added the leading zero for all files.