I would highly recommend your prison hire a dietitian to plan balanced menus for both sodium and cholesterol-restricted. If funds are short, start out with a consulting contract that just requires menu planning for a certain number of hours a week/month. Prisons are required to have a dietitian review their special diet restricted menus.
The Dietitians in Health Care Communities dietetic practice groups of the American Dietetic Association has a sub-group that specializes in correctional facilities. You can also find a dietitian at the American Dietetic Association. Include your zip code or city/state, the type of service you want (individual consultation).