🔑 Core Function

• Glucose–alanine cycle: Transports nitrogen from muscle to liver → converted into glucose for energy.
• ⚡ Energy metabolism: Provides fuel during fasting, exercise, or metabolic stress.
• Protein synthesis: Incorporated into enzymes, muscle, and structural proteins.
• ️ Immune & metabolic support: Contributes to energy supply during illness or injury.

🧬 Family & Essentiality

🌿 Plain-Language Summary

Alanine acts as a “courier amino acid”. It shuttles nitrogen and carbon between muscles and the liver, recycling protein into glucose for energy when the body is under stress (exercise, fasting, or illness).

⚗️ Molecular & Chemical IDs

• Abbreviation: Ala / A
• Chemical formula: C₃H₇NO₂
• Structure: Simple, non-polar amino acid with a methyl side chain

⚡ Functions

• Nitrogen shuttle: Carries amino groups from muscle → liver.
• ⚡ Glucose support: Key role in glucose–alanine cycle → maintains blood glucose.
• Protein role: Incorporated into nearly all proteins.
• Metabolic stress: Provides substrate during catabolic states (injury, sepsis).

🍽️ Absorption & Bioavailability

🇦🇺 Australian NRVs (NHMRC)

No specific NRV for alanine (non-essential). Adequate intake is covered by total protein requirements.

🥗 Food Sources

• Meat, poultry, fish
• Dairy products
• Eggs
• Legumes, soy, nuts, whole grains

Since alanine is made from pyruvate, sufficient carbohydrate and protein intake ensures adequate supply.

🧪 Testing & Monitoring

• Plasma amino acid profiling (specialist/research use).
• ❌ Not a routine clinical test.
• ALT note: Elevated alanine aminotransferase (ALT) is a liver enzyme marker, not the same as alanine levels.

🔄 Interactions

• Linked with glucose metabolism → rises during fasting, exercise, or catabolic stress.
• ⚠️ Abnormal levels may signal metabolic disorders or muscle breakdown.

🚨 Deficiency & Evidence

Deficiency

Deficiency not seen in normal diets; potential issues only in severe illness or extreme catabolic states.

Evidence Snapshot

• ✅ Established: Central in glucose–alanine cycle; vital for protein and glucose metabolism.
• ⚖️ Contextual: Supplementation rarely necessary; body synthesis and protein intake sufficient.