Apples are not toxic to cats if given properly, but certain parts of the apple are harmful. The flesh of the apple is generally safe for cats to eat in small amounts, but the seeds, core, and stem contain cyanide, which is toxic and should always be removed before offering apples to cats. Cats are obligate carnivores, so apples do not provide significant nutritional benefits to them. Excessive apple consumption, especially of the sugary flesh, can lead to digestive upset, obesity, or diabetes in cats. Apples should only be an occasional treat and never a regular part of a cat's diet.

Key Points:

• Apple flesh is safe in small, prepared portions (without seeds, core, or stem).
• Seeds, core, and stem contain cyanide, which is toxic to cats.
• Apples are not nutritionally necessary for cats and can cause digestive issues if overfed.
• Avoid offering apple products with additives such as cinnamon, sugar, or chocolate.
• Cats lack the taste receptors for sweetness, so they often ignore apples naturally.

In conclusion, apples are not toxic if served correctly, but care must be taken to remove all toxic parts and limit the quantity offered to cats to avoid health problems.