Friend or Foe: Dietary Restriction and Its Protective Effects on Responses to Ionizing Radiation

Area of Science:

• Radiation Biology
• Nutritional Science
• Cellular Stress Response

Background:

• Dietary restriction (DR) is known to extend lifespan and reduce age-related diseases.
• DR, including caloric reduction and fasting, significantly impacts cellular and systemic responses to ionizing radiation (IR).

Purpose of the Study:

• To review the mechanisms by which DR modulates responses to IR.
• To discuss the context-dependent effects of DR on radiation outcomes.
• To highlight the translational potential of DR in radiation oncology and injury reduction.

Main Methods:

• Literature review synthesizing current knowledge on DR and IR.
• Analysis of mechanisms including oxidative stress, inflammation, and DNA damage.
• Discussion of nutrient-sensing and stress-adaptive networks.

Main Results:

• DR's effects on radiation outcomes are highly context-dependent (tissue, metabolism, timing, IR conditions).
• Mechanisms involve regulation of oxidative stress, inflammation, mitochondrial function, DNA repair, and quality control.
• Distinct dietary paradigms interact with cellular networks to influence radiation sensitivity and recovery.

Conclusions:

• The timing, intensity, and composition of DR critically shape tissue responses to IR.
• Nutritional status is crucial for radiation risk assessment and therapeutic planning.
• DR holds translational potential for enhancing radiation oncology outcomes and mitigating radiation-induced injury.