Which of the following is a finding from studies of diet restriction in rats?

Question

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Studies of diet restriction in rats have shown that energy-restricted diets lead to a lowering of the metabolic rate and body temperature, which is thought to contribute to the observed increases in longevity. Restriction of specific nutrients has also been shown to have anti-aging effects, but this is not as widely studied or established as the effects of energy restriction. Life extension in 90 percent of rats on energy-restricted diets is not a finding that has been reported in the literature. Restricting food intake only after rats reach maturity, but not before, has not been specifically investigated in relation to life span extension.

Which of the Following Is a Finding from Studies of Diet