What is a common cause of nutritional cataracts in puppies and kittens?

Nutritional cataracts in puppies and kittens are frequently linked to specific deficiencies in essential nutrients, particularly amino acids. These amino acids play a crucial role in the body's metabolic processes, including the development and maintenance of healthy ocular tissues. A deficiency in them can lead to various developmental problems, including cataracts. This happens because inadequate amino acids can disrupt the lens's protein structure, leading to lens opacification or cataract formation.

The other options do not typically correlate with the same direct impact on the formation of cataracts. For instance, while excessive protein intake may lead to other metabolic issues, it does not have the same association with cataract development as amino acid deficiency does. Similarly, overexposure to sunlight primarily affects the cornea and other external structures rather than catalyzing cataract formation. Lastly, while high calcium levels can lead to other health problems not directly linked to cataracts in puppies and kittens, they do not reflect the nutritional basis for cataracts as seen with amino acid deficiencies. Thus, the connection between amino acid deficiency and nutritional cataracts is well documented, making it the most accurate choice.