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American Journal of Clinical Nutrition, Vol 36, 450-456, Copyright © 1982 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Refeeding after fasting in the rat: energy substrate fluxes and replenishment of energy stores

P Bjorntorp, S Edstrom, JG Kral, K Lundholm, E Presta, D Walks and MU Yang

Rats were fasted and refed and concentrations of plasma glucose, glycerol, triglyceride, insulin, and glucagon as well as glucose kinetics after injection of labeled glucose and glycerol were determined. In addition, concentrations and synthesis in vivo (from tritiated water) and in vitro of glycogen, triglycerides, and protein were followed in liver, muscle, and adipose tissues. The refeeding state after fasting was characterized by a decrease in glucose and triglyceride concentrations in plasma. Glucose turnover rate was increased. Protein losses were repleted, first in the liver then in muscle tissue. Synthesis of glycogen and lipid increased above control in liver and adipose tissue. These results are compatible with an increased outflux during refeeding of different energy substrates from plasma into the depleted protein and energy stores to an extent causing lower concentration of these substrates. Such phenomena might be of importance for energy intake regulation during the phase.


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