Intake of exogenous steroid causes:
**Core Concept**
The intake of exogenous steroids leads to suppression of the hypothalamic-pituitary-adrenal (HPA) axis, resulting in decreased production of endogenous steroids. This is a common side effect of long-term steroid use.
**Why the Correct Answer is Right**
When exogenous steroids are administered, they bind to glucocorticoid receptors in the hypothalamus, pituitary gland, and adrenal cortex, leading to negative feedback inhibition. This reduces the production of corticotropin-releasing hormone (CRH) and adrenocorticotropic hormone (ACTH), which in turn decreases the production of cortisol and other endogenous steroids. This suppression of the HPA axis is a critical concept in endocrinology and is often seen in patients on long-term steroid therapy.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the effect of exogenous steroids on the HPA axis.
**Option B:** This option is incorrect because it is not a direct consequence of exogenous steroid intake.
**Option C:** This option is incorrect because it is a potential side effect of steroid use, but not the primary effect on the HPA axis.
**Clinical Pearl / High-Yield Fact**
It is essential to note that the suppression of the HPA axis can be reversed after discontinuation of exogenous steroids, but this may take several months. Patients on long-term steroid therapy should be monitored closely for signs of adrenal insufficiency.
**Correct Answer:** C.