Vitamin D and Immunity
July 22, 2026Core Framework & Diagram Protein and Immunity
July 22, 2026
1 minuete Read
Protein and Immunity
Your immune system is built from protein
By the Editors 1-min read
When dieting, protein is the first calorie source to be reduced. With age, appetite decreases and meat intake dwindles. Vegetarianism is gaining followers, but whether protein intake is sufficient is often never carefully calculated.
All of these lead to the same consequence: the immune system's building materials are decreasing.
Antibodies are proteins. Cytokines are proteins. Complement proteins are proteins. Immune cells themselves are synthesized, divided, and activated using protein. Long-term insufficient protein intake won't collapse the immune system, but it will quietly, systematically downgrade it.
KEY TAKEAWAYS
01
All key immune system molecules — antibodies, cytokines, complement, immune cells themselves — are proteins requiring continuous, adequate amino acid supply.
02
Glutamine is immune cells' preferred energy substrate and nucleotide synthesis raw material; in high-stress states demand spikes and is the first amino acid depleted. Arginine supports NK cell and T cell activation capacity through NO synthesis.
03
Older adults need more protein (1.2–1.5 g/kg/day) but eat less — this is an intervnable factor in immune aging acceleration. Protein gap + declining immune efficiency = vicious cycle.
04
Recommended amounts: regular adults 1.0–1.2 g/kg/day, exercisers 1.2–1.6, older adults 1.2–1.5, acute infection/post-surgery 1.5–2.0. Most people's actual intake falls below these targets.
05
Protein quality (amino acid completeness) is equally important as quantity. Eggs, fish, and poultry are high-quality complete protein sources; vegetarians need food variety combinations. Distributing protein across meals maximizes utilization.
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