Altered Nutrient Sensing

Definition

Altered nutrient sensing refers to age-related changes in the cellular systems that detect and respond to energy, amino acids, glucose, oxygen, and other nutrient-related signals. Key nutrient-sensing pathways include insulin and IGF-1 signalling, mTOR, AMPK, and sirtuins, which help cells balance growth, repair, metabolism, and stress resistance. [1] [2] [3]

Why It Matters in Ageing Research

Altered nutrient sensing matters because many lifespan-extending interventions in model organisms, including dietary restriction and genetic changes in insulin-like signalling or mTOR-related pathways, affect how cells interpret nutrient availability. These pathways influence protein synthesis, autophagy, mitochondrial function, inflammation, cellular stress responses, and tissue maintenance. However, changing nutrient-sensing pathways in humans involves trade-offs and cannot be reduced to simply eating less or blocking growth signals. [4] [5] [6]

Common Confusion

• Altered nutrient sensing is not the same as nutrition advice; it refers to biological signalling pathways.
• Nutrient-sensing pathways are not always harmful when active; growth and repair require nutrient-responsive signalling.
• Findings from dietary restriction, fasting, or pathway inhibition in model organisms do not automatically translate into safe human anti-ageing interventions.

Related Reading

• Hallmarks of Ageing
• mTOR
• Sirtuins

References

1. Efeyan, A., Comb, W. C., & Sabatini, D. M. (2015). Nutrient-sensing mechanisms and pathways. https://doi.org/10.1038/nature14190
2. Laplante, M., & Sabatini, D. M. (2012). mTOR signaling in growth control and disease. https://doi.org/10.1016/j.cell.2012.03.017
3. Hardie, D. G., Ross, F. A., & Hawley, S. A. (2012). AMPK: a nutrient and energy sensor that maintains energy homeostasis. https://doi.org/10.1038/nrm3311
4. Lopez-Otin, C., et al. (2013). The Hallmarks of Aging. https://doi.org/10.1016/j.cell.2013.05.039
5. Fontana, L., Partridge, L., & Longo, V. D. (2010). Extending Healthy Life Span — From Yeast to Humans. https://doi.org/10.1126/science.1172539
6. Kennedy, B. K., Lamming, D. W., & Hekimi, S. (2022). Making sense of dietary restriction and ageing. https://doi.org/10.1038/s41586-022-05283-y