Changing cat food is an essential part of a cat's growth. As cats age, their nutritional needs change, and their health requires adjustments to their diet. Sometimes cats become picky eaters and lose interest in their usual brands. At this point, owners need to consider switching their cat's food. 
Because cats are very sensitive to changes in their diet, a smooth transition is essential. A smooth transition allows the enzymes in your cat's digestive tract to naturally regulate, making it easier to digest the carefully formulated new cat food and its rich nutrients.
When starting to switch your cat's food, you can mix the new cat food with their usual food. Over the next 7-10 days, gradually increase the proportion of the new food until they are completely fed the new food. If your cat experiences gastrointestinal discomfort during the initial stages of the switch, please don't panic; this is perfectly normal.
You can follow these steps:
Day 1: Add 1 part new cat food to 9 parts old cat food.
Day 2: Add 2 parts new cat food to 8 parts old cat food.
Day 3: Add 3 parts new cat food to 7 parts old cat food, and so on...
Day 10: Switch to all new cat food.
Of course, when choosing new cat food, you should select high-quality cat food that your cat loves to eat.
