The class of nutrient that produces certain hormones and forms a coating on nerves is lipids.

Here's why:

* Hormones: Many hormones, like steroid hormones (e.g., testosterone, estrogen, cortisol), are derived from cholesterol, a type of lipid.

* Nerve Coating: Lipids, specifically phospholipids, are the primary components of the myelin sheath. The myelin sheath is a fatty coating that insulates nerve fibers and allows for rapid transmission of nerve impulses.

While other nutrients like proteins are essential for various functions in the body, lipids are uniquely responsible for these specific roles.