There are a few things you can do to ensure that your Siamese cat is getting enough nutrition in his diet:

1. Make sure that you are feeding your cat a high-quality, nutritionally balanced diet. Look for a food that is formulated for cats and that meets the nutritional requirements established by the Association of American Feed Control Officials (AAFCO).
2. Feed your cat a diet that is appropriate for his life stage. Kittens have different nutritional needs than adult cats, and older cats may have different needs as well.
3. Monitor your cat’s weight and body condition. A healthy cat should have a visible waist and you should be able to feel his ribs without having to press hard.
4. Consult with your veterinarian if you have any concerns about your cat’s diet or nutritional status. They can help you determine if your cat has any specific dietary needs and make recommendations accordingly.
5. As a Siamese cat, they may be prone to obesity, so being mindful of the portion they are getting and providing a balanced diet with enough protein, vitamin and minerals is important
6. Provide a source of clean and fresh water as it is an essential part of a cat’s diet.
7. Lastly, be sure to provide your cat with plenty of mental and physical stimulation. Eating can be a form of enrichment for cats, so be sure to provide foraging opportunities for your cat by using food puzzles or hiding small meals around the house.

By following these guidelines, you can help ensure that your Siamese cat receives the nutrition he needs to stay healthy and happy.