PMID- 6865775 OWN - NLM STAT- MEDLINE DCOM- 19830826 LR - 20220321 IS - 0026-0495 (Print) IS - 0026-0495 (Linking) VI - 32 IP - 8 DP - 1983 Aug TI - The human metabolic response to chronic ketosis without caloric restriction: physical and biochemical adaptation. PG - 757-68 AB - To study the metabolic effects of ketosis without weight loss, nine lean men were fed a eucaloric balanced diet (EBD) for one week providing 35-50 kcal/kg/d, 1.75 g of protein per kilogram per day and the remaining kilocalories as two-thirds carbohydrate (CHO) and one-third fat. This was followed by four weeks of a eucaloric ketogenic diet (EKD)--isocaloric and isonitrogenous with the EBD but providing less than 20 g CHO daily. Both diets were appropriately supplemented with minerals and vitamins. Weight and whole-body potassium estimated by potassium-40 counting (40K) did not vary significantly during the five-week study. Nitrogen balance (N-Bal) was regained after one week of the EKD. The fasting blood glucose remained lower during the EKD than during the control diet (4.4 mmol/L at EBD, 4.1 mmol/L at EKD-4, P less than 0.01). The fasting whole-body glucose oxidation rate determined by a 13C-glucose primed constant infusion technique fell from 0.71 mg/kg/min during the control diet to 0.50 mg/kg/min (P less than 0.01) during the fourth week of the EKD. The mean serum cholesterol level rose (from 159 to 208 mg/dL) during the EKD, while triglycerides fell from 107 to 79 mg/dL. No disturbance of hepatic or renal function was noted at EKD-4. These findings indicate that the ketotic state induced by the EKD was well tolerated in lean subjects; nitrogen balance was regained after brief adaptation, serum lipids were not pathologically elevated, and blood glucose oxidation at rest was measurably reduced while the subjects remained euglycemic. FAU - Phinney, S D AU - Phinney SD FAU - Bistrian, B R AU - Bistrian BR FAU - Wolfe, R R AU - Wolfe RR FAU - Blackburn, G L AU - Blackburn GL LA - eng GR - AM-26349/AM/NIADDK NIH HHS/United States GR - GM-22691/GM/NIGMS NIH HHS/United States GR - RR-88/RR/NCRR NIH HHS/United States GR - etc. PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Metabolism JT - Metabolism: clinical and experimental JID - 0375267 RN - 0 (Blood Glucose) SB - IM MH - Acidosis/*blood MH - Adaptation, Physiological MH - Adult MH - Blood Glucose/analysis MH - Body Composition MH - *Diet MH - *Energy Intake MH - Humans MH - Ketosis/*blood MH - Kidney Function Tests MH - Liver Function Tests MH - Male MH - Oxidation-Reduction EDAT- 1983/08/01 00:00 MHDA- 1983/08/01 00:01 CRDT- 1983/08/01 00:00 PHST- 1983/08/01 00:00 [pubmed] PHST- 1983/08/01 00:01 [medline] PHST- 1983/08/01 00:00 [entrez] AID - 0026-0495(83)90105-1 [pii] AID - 10.1016/0026-0495(83)90105-1 [doi] PST - ppublish SO - Metabolism. 1983 Aug;32(8):757-68. doi: 10.1016/0026-0495(83)90105-1.