Increased alanine during prolonged fasting represents-
During prolonged fasting there is increased gluconeogenesis. Alanine is provided by the muscle is one of the substrates for gluconeogenesis and is called Glucose Alanine cycle. So plasma level of alanine increases in prolonged starvation.
Increased breakdown of muscle proteins
Impaired renal function
Decreased utilization of amino acid from Glucogenesis
Leakage of amino acids from cells due to plasma membrane leakage