Entomophagy - eating insects - provides cheap protien. Would you be happy if you were forced to eat insects?

I don't think you understand how ingrained some of these "voluntary" diets are; how strong taboo is.

EDIT: also, forcing people to eat a certain diet is disproportionately punishng them. Do we give those prisoners reductions in their sentence just because they were life-long vegans before they went to prison?