Is a cat being picky about food because it's sick? How can you tell if a cat is sick?
A cat's picky eating may be due to illness. If a cat keeps lingering by its food bowl without eating, or only eats one or two kibbles before giving up, it may be due to oral disease. Owners should quickly check the cat's mouth for any abnormal symptoms such as redness, swelling, ulcers, or sores.
A cat's picky eating may be due to illness. If your cat keeps lingering by its food bowl without eating, or only eats one or two kibbles before giving up, you should quickly check its mouth for any abnormal symptoms such as sores, redness, swelling, or ulcers. If your cat has stomatitis or gum disease, it will be unable to eat due to pain and you should take it to the vet as soon as possible. 
Cats are picky eaters or don't get enough exercise
If a cat doesn't exercise all day, it burns fewer calories and naturally eats less. Therefore, it's a good way for cat owners to exercise with their cats regularly to help them maintain a normal level of energy expenditure and increase their appetite.
The cat is a picky eater or the cat food doesn't suit its taste.
Cats also have different taste preferences. Some cats like seafood, some like poultry, and some like meat. There are many types of cat food on the market, giving cat owners a wide range of choices. Some stores also sell small sample packs, allowing cat owners to buy a few different kinds and choose one that their cat likes as its main food.
Cats may be picky eaters or prefer to eat soft food.
Regarding food, some cats don't like hard foods and prefer liquid foods. Older cats, due to decreased chewing ability, may prefer softer foods. In these cases, owners might consider switching to canned main kibble (note: canned main kibble, not treats; the two are very different!).
Cats are picky eaters or eat too many treats
There's a wide variety of cat treats available, but treats are still treats. They might be tastier and more appealing to cats than their main food, but the nutritional content of treats is far less comprehensive than that of main food. If a cat eats too many delicious treats, its stomach will always feel full, and who would want to eat the bland and monotonous main food then? Therefore, treats should be given in moderation and not in excess.
Cat is a picky eater or the cat bowl is not suitable
Sometimes, stubborn and picky cats have certain requirements for their food bowls. For example, if the bowl is too big or too small, it will be inconvenient for them to eat. Also, if the bowl is too dirty, has an odor, or has mixed smells, they may refuse to use it. The height of the bowl is also important; a lower bowl is fine, but if it's too high, the cat will strain its neck and feel uncomfortable, which may also make it less likely to eat.