Macronutrient & Micronutrient Optimization — References

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Parent Topic: Macronutrient & Micronutrient Optimization | References Hub: 01 - Foundations References MOC

Primary Literature & Landmark Studies

Citation: Morton, R. W., Murphy, K. T., McKellar, S. R., Schoenfeld, B. J., Henselmans, M., Helms, E., Aragon, A. A., Devries, M. C., Banfield, L., Krieger, J. W., & Phillips, S. M. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 52(6), 376–384.
Identifiers: DOI: 10.1136/bjsports-2017-097608 (DOI · SciDB · Scholar) | PMID: 28698222 (PubMed · Europe PMC)
Study Design: Systematic review, meta-analysis, and meta-regression of 49 randomized controlled trials ( $N = 1, 863$ participants) lasting $\geq 6$ weeks.
Key Quantitative Outcomes:
- Dietary protein supplementation during resistance training significantly increased fat-free mass ( $FFM : + 0.30 kg, p = 0.007$ ), one-repetition maximum strength ( $+ 2.49 kg, p = 0.01$ ), and myofiber cross-sectional area ( $+ 310 μ m^{2}, p = 0.02$ ).
- Biphasic linear regression identified a plateau breakpoint for FFM accretion at a total daily protein intake of 1.62 g/kg/day (95% CI: 1.03–2.20 g/kg/day).

Citation: Schoenfeld, B. J., & Aragon, A. A. (2018). How much protein can the body use in a single meal for muscle-building? Implications for daily protein distribution. Journal of the International Society of Sports Nutrition, 15, 10.
Identifiers: DOI: 10.1186/s12970-018-0215-1 (DOI · SciDB · Scholar) | PMID: 29497353 (PubMed · Europe PMC)
Study Design: Quantitative physiological review and synthesis of acute stable-isotope amino acid tracer trials vs. longitudinal resistance training body composition RCTs.
Key Quantitative Outcomes:
- Established that to reach a target daily protein intake of 1.6–2.2 g/kg/day while maximizing myofibrillar fractional synthetic rate (FSR) across the 24-hour window, protein should be dosed at 0.40 g/kg/meal to 0.55 g/kg/meal across a minimum of 4 meals.

Citation: Harris, W. S., Tintle, N. L., Imamura, F., Qian, F., Korat, A. V. A., Marklund, M., Djoussé, L., Bassett, J. K., Carmichael, P. H., Chen, Y. Y., Hirakawa, Y., Kader, S., Lankinen, M., Liu, J., Lind, L., Samieri, C., Senn, M. K., Tsai, M. Y., Virtanen, J. K., … & Fatty Acids and Outcomes Research Consortium (FORCE). (2021). Blood n-3 fatty acid levels and total and cause-specific mortality from 17 prospective studies. Nature Communications, 12(1), 2329.
Identifiers: DOI: 10.1038/s41467-021-22370-2 (DOI · SciDB · Scholar) | PMID: 33888689 (PubMed · Europe PMC)
Study Design: Harmonized individual-level pooled analysis of 17 prospective cohort studies ( $N = 42, 466$ individuals followed for a median of 16 years; 15,720 deaths).
Key Quantitative Outcomes:
- Comparing the 90th to the 10th percentile of circulating long-chain omega-3 fatty acids (EPA + DPA + DHA), multivariable-adjusted hazard ratios for all-cause mortality were 15–18% lower ( $HR = 0.85, 95% CI [0.80, 0.90], p < 0.0001$ ), alongside a 15% reduction in cardiovascular mortality and 11% reduction in cancer mortality.

Citation: Ames, B. N. (2006). Low micronutrient intake may accelerate the degenerative diseases of aging through allocation of scarce micronutrients by triage. Proceedings of the National Academy of Sciences (PNAS), 103(47), 17589–17594.
Identifiers: DOI: 10.1073/pnas.0608757103 (DOI · SciDB · Scholar) | PMID: 17101959 (PubMed · Europe PMC)
Study Design: Mechanistic systems-biology synthesis of human micronutrient deficiencies, DNA damage biomarkers, and mitochondrial oxidative stress.
Key Quantitative Outcomes:
- Demonstrated that subclinical deficiencies in essential cofactors (magnesium, zinc, iron, folate, vitamin $B_{12}$ , vitamin K) induce double-strand DNA breaks and mitochondrial oxidative lesions indistinguishable from ionizing radiation, due to evolutionary triage favoring acute survival proteins over longevity maintenance enzymes.