Parrot food is typically high in fat and protein and low in carbohydrates, which is ideal for parrots' high energy needs. Cockatiels, on the other hand, are relatively low-energy birds and need a diet that is higher in carbohydrates and lower in fat and protein. A diet that is too high in fat and protein can lead to obesity, liver disease, and other health problems in cockatiels.
In addition, parrot food often contains ingredients that are not safe for cockatiels. For example, parrot food may contain nuts and seeds, which are a choking hazard for cockatiels. Parrot food may also contain fruits that are high in sugar, which can lead to obesity and other health problems in cockatiels.
For these reasons, it is important to avoid feeding parrot food to cockatiels. There are a number of commercial cockatiel foods available that are nutritionally complete and safe for cockatiels. If you are unsure about what to feed your cockatiel, talk to your veterinarian.