## **Core Concept**
The addition of amino acids in the diet of a seriously ill patient leading to a positive nitrogen balance involves understanding the role of amino acids in protein synthesis and metabolism. Amino acids are the building blocks of proteins, and their supplementation can influence the body's nitrogen balance by promoting anabolic processes.

## **Why the Correct Answer is Right**
The correct answer, **Insulin**, plays a crucial role in promoting a positive nitrogen balance. Insulin is an anabolic hormone that facilitates the uptake of amino acids by cells, thereby promoting protein synthesis. When amino acids are added to the diet of a seriously ill patient, they stimulate insulin secretion. This increase in insulin levels helps in reducing protein catabolism and enhancing protein synthesis, leading to a positive nitrogen balance. Insulin also inhibits the breakdown of proteins and promotes the storage of amino acids in muscles.

## **Why Each Wrong Option is Incorrect**
- **Option A: Glucagon** - Glucagon is a catabolic hormone that raises blood glucose levels by stimulating glycogenolysis and gluconeogenesis. It does not promote a positive nitrogen balance and instead can lead to increased protein breakdown.
- **Option B: Growth Hormone** - While growth hormone does have anabolic effects and can influence protein synthesis, its primary role is not directly related to the acute regulation of nitrogen balance in response to amino acid supplementation.
- **Option C: Glucocorticoids** - Glucocorticoids are steroid hormones that have catabolic effects, including the breakdown of muscle protein. They generally lead to a negative nitrogen balance, which is the opposite of the effect described.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that in critically ill patients, the administration of amino acids can stimulate insulin release, which in turn can help achieve a positive nitrogen balance by promoting protein synthesis and inhibiting protein degradation. This concept is crucial in the management of critically ill patients to support their nutritional needs and promote recovery.

## **Correct Answer:** . **Insulin**