Objectives:
The aim of the research was to check whether, and to what extent, dietary changes affect the selected indicators of health, including well-being

Methods:
The study, lasting 3 years, included 52 chronically mentally ill people. Hand grip strength (HGS) measurements ‟before” and ‟after” feeding adjustments were performed using a SaehanTM pear dynamometer, blood pressure measurements were made using an Omron blood pressure monitor. Well-being was assessed using the UMACL Adjective Mood Scale. Based on the analysis of medical records, the study also included: the number of infections of the upper respiratory tract, the number of autoaggressive/aggressive behaviors and the frequency of stay of extremely offensive/agitated residents in the hospital.

Results:
The dietary changes were reflected in the increased value of the hand grip strength (especially in women), lowered or normalized blood pressure to normal or recommended values, lowered tension arousal, accompanied by an increase in energetic arousal and hedonic tone (translating into improved well-being and mood), and a decrease in the number of episodes of aggression/self-aggression and associated hospitalizations.

Conclusions:
The dietary changes resulted in an improvement in the tested parameters as well as in reduction in the amount of food wasted by the residents. There was also a decrease in the number of catarrh of the upper respiratory tract, which reduced the overall number and quantity of prescribed drugs.