PMID- 15897479 OWN - NLM STAT- MEDLINE DCOM- 20051121 LR - 20111117 IS - 1071-7323 (Print) IS - 1071-7323 (Linking) VI - 13 IP - 4 DP - 2005 Apr TI - Insulin sensitivity determines the effectiveness of dietary macronutrient composition on weight loss in obese women. PG - 703-9 AB - OBJECTIVE: To determine whether macronutrient composition of a hypocaloric diet can enhance its effectiveness and whether insulin sensitivity (Si) affects the response to hypocaloric diets. RESEARCH METHODS AND PROCEDURES: Obese nondiabetic insulin-sensitive (fasting insulin < 10 microU/mL; n = 12) and obese nondiabetic insulin-resistant (fasting insulin > 15 microU/mL; n = 9) women (23 to 53 years old) were randomized to either a high carbohydrate (CHO) (HC)/low fat (LF) (60% CHO, 20% fat) or low CHO (LC)/high fat (HF) (40% CHO, 40% fat) hypocaloric diet. Primary outcome measures after a 16-week dietary intervention were: changes in body weight (BW), Si, resting metabolic rate, and fasting lipids. RESULTS: Insulin-sensitive women on the HC/LF diet lost 13.5 +/- 1.2% (p < 0.001) of their initial BW, whereas those on the LC/HF diet lost 6.8 +/- 1.2% (p < 0.001; p < 0.002 between the groups). In contrast, among the insulin-resistant women, those on the LC/HF diet lost 13.4 +/- 1.3% (p < 0.001) of their initial BW as compared with 8.5 +/- 1.4% (p < 0.001) lost by those on the HC/LF diet (p < 0.04 between two groups). These differences could not be explained by changes in resting metabolic rate, activity, or intake. Overall, changes in Si were associated with the degree of weight loss (r = -0.57, p < 0.05). DISCUSSION: The state of Si determines the effectiveness of macronutrient composition of hypocaloric diets in obese women. For maximal benefit, the macronutrient composition of a hypocaloric diet may need to be adjusted to correspond to the state of Si. FAU - Cornier, Marc-Andre AU - Cornier MA AD - Department of Medicine, University of Colorado Health Sciences Center, Denver, CO, USA. FAU - Donahoo, W Troy AU - Donahoo WT FAU - Pereira, Rocio AU - Pereira R FAU - Gurevich, Inga AU - Gurevich I FAU - Westergren, Rickard AU - Westergren R FAU - Enerback, Sven AU - Enerback S FAU - Eckel, Peter J AU - Eckel PJ FAU - Goalstone, Marc L AU - Goalstone ML FAU - Hill, James O AU - Hill JO FAU - Eckel, Robert H AU - Eckel RH FAU - Draznin, Boris AU - Draznin B LA - eng GR - DK48520/DK/NIDDK NIH HHS/United States GR - M01 RR00051/RR/NCRR NIH HHS/United States GR - RR16185/RR/NCRR NIH HHS/United States PT - Clinical Trial PT - Journal Article PT - Randomized Controlled Trial PT - Research Support, N.I.H., Extramural PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Obes Res JT - Obesity research JID - 9305691 RN - 0 (Dietary Carbohydrates) RN - 0 (Dietary Fats) RN - 0 (Insulin) SB - IM MH - Adult MH - Basal Metabolism MH - Body Mass Index MH - *Diet, Reducing MH - Dietary Carbohydrates/administration & dosage MH - Dietary Fats/administration & dosage MH - Energy Intake MH - Energy Metabolism MH - Fasting MH - Female MH - Humans MH - Insulin/blood MH - *Insulin Resistance MH - Middle Aged MH - Obesity/physiopathology/*therapy MH - Treatment Outcome MH - *Weight Loss EDAT- 2005/05/18 09:00 MHDA- 2005/12/13 09:00 CRDT- 2005/05/18 09:00 PHST- 2005/05/18 09:00 [pubmed] PHST- 2005/12/13 09:00 [medline] PHST- 2005/05/18 09:00 [entrez] AID - 13/4/703 [pii] AID - 10.1038/oby.2005.79 [doi] PST - ppublish SO - Obes Res. 2005 Apr;13(4):703-9. doi: 10.1038/oby.2005.79.