Which of the following is NOT related to nitrites?

The option identifying cholesterol levels as not related to nitrites is accurate because nitrites primarily interact with other physiological processes that do not directly influence cholesterol levels. Nitrites are known for their role in the body concerning oxygen transport and can impact hemoglobin, where they can form methemoglobin, which reduces the blood's capacity to carry oxygen. This is particularly significant in infants, who are more susceptible to the effects of nitrites due to their developing systems.

Toxic compounds relate to nitrites since they can be harmful in certain concentrations and contexts, particularly regarding their formation from nitrate through microbial action, possibly leading to health risks. Additionally, the vulnerability of infants is a well-documented concern with nitrite exposure, as methemoglobinemia, a condition caused by excessive nitrite levels, can occur more readily in young children.

Thus, cholesterol levels do not have a direct association with nitrites, making them the correct choice for this question.