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How to spot signs of nutritional deficiency in cats
Search for missing patches of fur.
Look over your cat for signs of missing fur. One of the first symptoms of malnutrition in cats is loss of fur, so bald spots signal that your cat may be missing something from its diet.

Pick from:
a). If you've found a stray cat or adopted a cat, also check for dark fur patches. When a cat loses fur due to nutritional deficiency, it grows back darker.;
b). If the fur on your cat seems to be thinning or has brown spots on it, it is probably deficient in protein, and its coat may be very dirty and matted. Thick, undigested hair is the telltale sign of malnutrition.;
c). Instead of missing patches of fur, you should quickly look at your cat every day and count how many hairs your cat has missing each day. You may notice that one hair sticks up, so this could mean your cat is missing at least one or two.;
d). If your cat is missing patches of fur, count out how many patches of fur you see before your cat goes missing. Check for more than one missing patch of fur.;
a).