Short answer: food grade terms like "holistic" and "premium" aren't official, legally defined standards — they're closer to marketing language that manufacturers apply at their own discretion. What actually matters is the ingredient order and the crude protein/crude fat ratio.
Can I really trust "holistic" or "premium" food grades?
These labels aren't an official grading system certified by any government or association. Standards vary wildly between brands, so checking the actual ingredient panel is far more accurate than judging quality from a grade label alone.
What should I check first on the back of the bag?
Ingredients are listed in order from highest to lowest content. The key is checking whether a clear meat source (chicken, salmon, etc.) appears near the top, rather than a vague term like "meat by-products."
Do I really need to worry about whether grains are included?
If your cat has no allergies or digestive issues, grains themselves aren't automatically bad. That said, if there's an allergic reaction or frequent vomiting/diarrhea, switching to a grain-free food is worth considering.
Does a higher price mean better food?
Price and quality aren't always proportional. Rather than price alone, it's more important to look at ingredient order, the crude protein/crude fat ratio, and how well your own cat actually eats and digests it.
What should I watch out for when switching foods?
Switching everything all at once can upset a sensitive digestive system. It's safer to mix in the new food gradually with the old, transitioning the ratio over 7–10 days.