Most people in the developed world die from age related diseases - cancer and heart disease are included - so the 20% increase seems more likely to apply to us. Still, the net effect of 30% calorie restriction is that the lifetime amount of food one gets to eat is still reduced by about 10%.
Caloric restriction (CR) without malnutrition increases longevity and delays the onset of age-associated disorders in short-lived species, from unicellular organisms to laboratory mice and rats. The value of CR as a tool to understand human ageing relies on translatability of CR’s effects in primates. Here we show that CR significantly improves age-related and all-cause survival in monkeys on a long-term ~30% restricted diet since young adulthood.