Energy balance
Calorie restriction induces mitochondrial biogenesis via the PGC-1α pathway, resulting in a higher number of mitochondria that operate with lower oxygen consumption and reduced reactive oxygen species (ROS) production while maintaining ATP levels.
Long-term calorie restriction appears to improve cellular health by increasing the number and efficiency of mitochondria. This process reduces oxidative stress and maintains energy (ATP) levels despite lower oxygen use. While this mechanism is robust in animal models, direct application to humans requires careful consideration of individual health status and should be approached with medical guidance, as the study primarily uses serum transfer models.
We report that CR reduces oxidative stress at the same time that it stimulates the proliferation of mitochondria through a peroxisome proliferation-activated receptor coactivator 1α signaling pathway... CR can induce a peroxisome proliferation-activated receptor coactivator 1α-dependent increase in mitochondria capable of efficient and balanced bioenergetics to reduce oxidative stress and attenuate age-dependent endogenous oxidative damage.
Why this rating
The study uses multiple in vitro and in vivo models (HeLa, FaO, rat hepatocytes, rat liver) with consistent results, though it relies on serum transfer models rather than direct dietary manipulation in humans.
Source
Calorie restriction induces mitochondrial biogenesis and bioenergetic efficiency
Guillermo López‐Lluch et al. · Proceedings of the National Academy of Sciences · 2006
DOI 10.1073/pnas.0510452103
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