If you want your cat to live a long and healthy life, then a nutritious and balanced diet is essential. Cats are relatively picky about their diet, so you need to be extra careful in feeding and food selection. We all know that cats are carnivores and meat is very important for their healthy growth, and their protein needs are much higher than those of dogs and us humans, so we need to ensure that our cats have adequate nutritional intake during feeding, but not too much to cause obesity.   1.Selection of cat food There are many different types of cat food, and the three more common ones are dry food, semi-wet food and wet food. Dry food is a solid food mixed with meat and grains and other nutrients, and is nutritionally balanced. It has a low moisture content, so it's important to make sure your cat stays hydrated. Dry food is cost-effective and has a longer shelf life than wet food. Semi-moist food is moist to the touch and has a good taste. It's popular with cats and is generally softer than dry food, making it easier for young and senior cats to eat. However, it's not very conducive to preservation as it will deteriorate quickly after opening. Wet food is high in protein and fat and has a strong flavor that cats tend to favor. It's a good option for cats with low appetites, but it has a high moisture content and can spoil quickly after opening, so it's important to store it properly in the refrigerator and consume it within a day. 2. Disorders of intestinal flora 2-1. Weight Although each individual and different breeds of cats vary greatly, in general a 12-month-old cat is considered an adult and should be fed twice a day. A 4-kg cat needs about 1100 kJ of calories per day, and 10 grams of food with water has about 400 kJ of energy, and this cat needs to eat about 275 grams of canned food a day to be full. This figure is for reference only. In order to prevent cats from eating too much or from diseases caused by insufficient nutritional intake, it is best to