One of the first studies to explore the effects of calorie restriction on humans showed that cutting caloric intake by 15 percent for two years slowed aging and metabolism and protected against age-related disease.
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Leanne M. Redman, Steven R. Smith, Jeffrey H. Burton, Corby K. Martin, Dora Il’yasova, Eric Ravussin. Metabolic Slowing and Reduced Oxidative Damage with Sustained Caloric Restriction Support the Rate of Living and Oxidative Damage Theories of Aging. Cell Metabolism, 2018; DOI: 10.1016/j.cmet.2018.02.019