Providing nutritionally appropriate diets in captivity is more complex than it appears. Nutritional deficiencies and excesses cause significant welfare problems in zoo animals.
Nutritional welfare in zoo animals requires species-specific knowledge that is often complex. Browsers like giraffes must receive appropriate fiber ratios to maintain gut health. Toucans and mynahs that eat high-iron diets in captivity develop iron storage disease — their wild diets are naturally low in iron. Primates given human-equivalent processed diets develop cardiovascular disease. Obesity from unlimited food provision reduces life quality and contributes to joint disease. Feeding enrichment that requires animals to search for and manipulate food addresses both nutritional delivery and behavioral welfare simultaneously.