When a cat is not eating, has no energy, and is losing weight, the pet owner needs to take the cat to the hospital immediately for a comprehensive examination, including infectious diseases, blood routine, detailed biochemical examination, and if necessary, X Auxiliary examinations such as light and B-ultrasound are performed, and then symptomatic treatment is carried out based on the examination results. If everything is normal, you can properly supplement the cat with some trace elements, vitamins, etc. Some products on the market that improve appetite and help nutritional intake have good effects.