Feeding the Cat

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For this reason, his diet must be specific and adequate.

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tactically speaking, most domestic cats do NOT eat a "balanced diet."
The most common mistakes concern:

Excess of carbohydrates.
Water shortage.
Replacement of animal proteins with vegetable ones.

For further information: What should the cat eat? and the cellular metabolism of all tissues even completely excluding carbohydrates from the diet.
By feeding your cat an excessive percentage of sugars, you run the risk of:

Create hyperglycemia, hyperinsulinemia, insulin resistance and ultimately insulin-dependent diabetes mellitus.
Promote overweight.

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The liquid dispersion of the feline organism is very low compared to that of humans. Cats do not sweat and dissipate heat thanks to pulmonary ventilation.
Furthermore, the wild cat's diet includes only foods very rich in water (meat, blood, internal organs, etc.).
Also for this reason, nature has NOT endowed the little cats with a highly developed thirst stimulus; a dehydrated cat has a poor perception of his real condition.
Systemic dehydration is a discomfort that can cause dire consequences even in the long term.
For example, mainly the organs of the urinary tract are damaged, which function properly ONLY when hydration is optimal.
A dehydrated cat is more prone to:

Kidney stones.
Blockages of the urinary tract.
Cystitis.

and the cat's metabolism has evolved to eat exclusively animal-based foods.
The feline is NOT omnivorous, nor even vegan. It is a very efficient hunter definable as an "obligate carnivore".
This "obligation" to eat meat is not an "imposition of the human being (as claimed by a part of the vegan community), but a" natural evolution of the Species.

The bond to which the felines themselves have chosen to adhere over the millennia has made them unable to digest and metabolize many plant molecules.
The feline organism does not enjoy the presence of starch, fructose and fiber. Cats only consume carbohydrates in the form of glycogen contained in the muscles and liver of their prey.
Just think that cats eat grass especially when they feel the need to throw up.
Furthermore, the physiology of cats requires a very precise and different protein composition compared to that of cereals, legumes, tubers, oil seeds, fruits and vegetables.
The lack of natural prey for the cat often causes a nutritional deficiency. These deficiencies are mainly linked to the protein intake, the amino acid profile, the total content of calcium and phosphorus, and their ratio.

For further information: Cat feeding: choice of food and label reading