Im not one for making bold statements but eugh that diamond rubbish makes me feel sick reading it.
They say you get what you pay for and golly gum its so true in this instance.
Please consider another type of dried food??
ORIJEN CAT

Biologically Appropriate for ALL CATS AND KITTENS
ORIJEN Cat is formulated with a biologically correct (75/25/0) ingredient ratio of 75% meat, 25% fruit and vegetables and 0 grain.
DIAMOND CAT

Crude Protein 30.0% Minimum
Crude Fat 15.0% Minimum
Crude Fiber 3.0% Maximum
Moisture 10.0% Maximum
Ash 6.0% Maximum
Calcium 0.8% Minimum
Phosphorus 0.65% Minimum
Potassium 0.7% Minimum
Magnesium 0.1% Maximum
Selenium 0.4 mg/kg Minimum
Vitamin E 100 IU/kg Minimum
Taurine 0.1% Minimum
Omega-6 Fatty Acids * 2.4% Minimum
Omega-3 Fatty Acids * 0.4% Minimum
* Not recognized as an essential nutrient by the AAFCO Cat Food Nutrient Profile.
Calorie Content: 3,742 kcal/kg (350 kcal/cup) Calculated Metabolizable Energy.