Why are sunflower seeds and peanuts bad for chinchillas?

Sunflower seeds and peanuts are high in fat and can lead to obesity and other health issues in chinchillas if fed excessively. These treats can also disrupt their digestive system, as chinchillas require a high-fiber diet mainly consisting of hay and pellets. Additionally, sunflower seeds can be too rich and may cause dental problems due to their hard texture. It's important to offer chinchillas appropriate treats in moderation to maintain their health.