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Effects of caloric restriction and/or NR supplementation on gastrocnemius muscle and body weight gain. (A) Δ weight gain. (B) Absolute weight of gastrocnemius. (C) Relative weight of gastrocnemius. SD, standard diet; CR, caloric restriction; CAFD, cafeteria diet; g, gram; Δ, delta denominator (indicates in grams how much the body weight of the animals increased or decreased at the end of 4 weeks of intervention).
