Final Answer:
Amino acids are conditionally essential when the body cannot produce them in sufficient quantities under certain physiological conditions, such as illness, stress, or during specific life stages.
Step-by-step explanation:
Amino acids are classified as essential, non-essential, or conditionally essential based on the body's ability to synthesize them. Essential amino acids must be obtained from the diet since the body cannot produce them. Non-essential amino acids are synthesized by the body. Conditionally essential amino acids become essential under specific conditions where the body's normal synthesis may be insufficient.
This occurs during periods of stress, illness, rapid growth, or other physiological challenges. Under these circumstances, the body's demand for certain amino acids exceeds its ability to produce them, making their dietary intake essential for maintaining proper protein synthesis and overall health.