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Validation of an inexpensive and accurate mathematical method to measure long-term changes in free-living energy intake.(Report)(Author abstract)

Background: Accurate measurement of free-living energy intake (El) over long periods is imperative for understanding obesity and its treatment. Unfortunately, traditional methods rely on self-report and are notoriously inaccurate. Although El can be indirectly estimated by the intake-balance method,... Full description

Journal Title: American Journal of Clinical Nutrition 2015, Vol.102(2), p.353(6)
Main Author: Sanghvi, Arjun
Other Authors: Redman, Leanne M. , Martin, Corby K. , Ravussin, Eric , Hall, Kevin D.
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0002-9165
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recordid: gale_ofg426765853
title: Validation of an inexpensive and accurate mathematical method to measure long-term changes in free-living energy intake.(Report)(Author abstract)
format: Article
creator:
  • Sanghvi, Arjun
  • Redman, Leanne M.
  • Martin, Corby K.
  • Ravussin, Eric
  • Hall, Kevin D.
subjects:
  • Low Calorie Diet – Research
  • Weight Loss – Measurement
ispartof: American Journal of Clinical Nutrition, 2015, Vol.102(2), p.353(6)
description: Background: Accurate measurement of free-living energy intake (El) over long periods is imperative for understanding obesity and its treatment. Unfortunately, traditional methods rely on self-report and are notoriously inaccurate. Although El can be indirectly estimated by the intake-balance method, this technique is prohibitively labor-intensive and expensive, requiring repeated measures of energy expenditure via doubly labeled water (DLW) along with multiple dual-energy X-ray absorptiometry (DXA) scans to measure changes in body energy stores. Objective: Our objective was to validate a mathematical method to measure long-term changes in free-living energy intake. Design: We measured body weight and El changes ([DELTA]EI) over 4 time intervals by using the intake-balance method in 140 individuals who underwent 2 y of caloric restriction as part of the Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy study. We compared the [DELTA]EI values calculated by using DLW/DXA with those obtained by using a mathematical model of human metabolism whose only inputs were the initial demographic information and repeated body weight data. Results: The mean [DELTA]EI values calculated by the model were within 40 kcal/d of the DLW/DXA method throughout the 2-y study. For individual subjects, the overall root mean square deviation between the model and DLW/DXA method was 215 kcal/d, and most of the model-calculated [DELTA]EI values were within 132 kcal/d of the DLW/ DXA method. Conclusions: Accurate and inexpensive estimates of [DELTA]EI that are s comparable to the DLW/DXA method can be obtained by using a mathematical model and repeated body weight measurements. This trial was registered at clinicaltrials.gov as NCT00427193. Keywords: caloric restriction, dietary assessment, energy balance, energy intake, mathematical modeling, weight loss doi: 10.3945/ajcn.115.111070
language: eng
source:
identifier: ISSN: 0002-9165
fulltext: fulltext
issn:
  • 0002-9165
  • 00029165
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titleValidation of an inexpensive and accurate mathematical method to measure long-term changes in free-living energy intake.(Report)(Author abstract)
creatorSanghvi, Arjun ; Redman, Leanne M. ; Martin, Corby K. ; Ravussin, Eric ; Hall, Kevin D.
ispartofAmerican Journal of Clinical Nutrition, 2015, Vol.102(2), p.353(6)
identifierISSN: 0002-9165
subjectLow Calorie Diet – Research ; Weight Loss – Measurement
descriptionBackground: Accurate measurement of free-living energy intake (El) over long periods is imperative for understanding obesity and its treatment. Unfortunately, traditional methods rely on self-report and are notoriously inaccurate. Although El can be indirectly estimated by the intake-balance method, this technique is prohibitively labor-intensive and expensive, requiring repeated measures of energy expenditure via doubly labeled water (DLW) along with multiple dual-energy X-ray absorptiometry (DXA) scans to measure changes in body energy stores. Objective: Our objective was to validate a mathematical method to measure long-term changes in free-living energy intake. Design: We measured body weight and El changes ([DELTA]EI) over 4 time intervals by using the intake-balance method in 140 individuals who underwent 2 y of caloric restriction as part of the Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy study. We compared the [DELTA]EI values calculated by using DLW/DXA with those obtained by using a mathematical model of human metabolism whose only inputs were the initial demographic information and repeated body weight data. Results: The mean [DELTA]EI values calculated by the model were within 40 kcal/d of the DLW/DXA method throughout the 2-y study. For individual subjects, the overall root mean square deviation between the model and DLW/DXA method was 215 kcal/d, and most of the model-calculated [DELTA]EI values were within 132 kcal/d of the DLW/ DXA method. Conclusions: Accurate and inexpensive estimates of [DELTA]EI that are s comparable to the DLW/DXA method can be obtained by using a mathematical model and repeated body weight measurements. This trial was registered at clinicaltrials.gov as NCT00427193. Keywords: caloric restriction, dietary assessment, energy balance, energy intake, mathematical modeling, weight loss doi: 10.3945/ajcn.115.111070
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descriptionBackground: Accurate measurement of free-living energy intake (El) over long periods is imperative for understanding obesity and its treatment. Unfortunately, traditional methods rely on self-report and are notoriously inaccurate. Although El can be indirectly estimated by the intake-balance method, this technique is prohibitively labor-intensive and expensive, requiring repeated measures of energy expenditure via doubly labeled water (DLW) along with multiple dual-energy X-ray absorptiometry (DXA) scans to measure changes in body energy stores. Objective: Our objective was to validate a mathematical method to measure long-term changes in free-living energy intake. Design: We measured body weight and El changes ([DELTA]EI) over 4 time intervals by using the intake-balance method in 140 individuals who underwent 2 y of caloric restriction as part of the Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy study. We compared the [DELTA]EI values calculated by using DLW/DXA with those obtained by using a mathematical model of human metabolism whose only inputs were the initial demographic information and repeated body weight data. Results: The mean [DELTA]EI values calculated by the model were within 40 kcal/d of the DLW/DXA method throughout the 2-y study. For individual subjects, the overall root mean square deviation between the model and DLW/DXA method was 215 kcal/d, and most of the model-calculated [DELTA]EI values were within 132 kcal/d of the DLW/ DXA method. Conclusions: Accurate and inexpensive estimates of [DELTA]EI that are s comparable to the DLW/DXA method can be obtained by using a mathematical model and repeated body weight measurements. This trial was registered at clinicaltrials.gov as NCT00427193. Keywords: caloric restriction, dietary assessment, energy balance, energy intake, mathematical modeling, weight loss doi: 10.3945/ajcn.115.111070
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abstractBackground: Accurate measurement of free-living energy intake (El) over long periods is imperative for understanding obesity and its treatment. Unfortunately, traditional methods rely on self-report and are notoriously inaccurate. Although El can be indirectly estimated by the intake-balance method, this technique is prohibitively labor-intensive and expensive, requiring repeated measures of energy expenditure via doubly labeled water (DLW) along with multiple dual-energy X-ray absorptiometry (DXA) scans to measure changes in body energy stores. Objective: Our objective was to validate a mathematical method to measure long-term changes in free-living energy intake. Design: We measured body weight and El changes ([DELTA]EI) over 4 time intervals by using the intake-balance method in 140 individuals who underwent 2 y of caloric restriction as part of the Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy study. We compared the [DELTA]EI values calculated by using DLW/DXA with those obtained by using a mathematical model of human metabolism whose only inputs were the initial demographic information and repeated body weight data. Results: The mean [DELTA]EI values calculated by the model were within 40 kcal/d of the DLW/DXA method throughout the 2-y study. For individual subjects, the overall root mean square deviation between the model and DLW/DXA method was 215 kcal/d, and most of the model-calculated [DELTA]EI values were within 132 kcal/d of the DLW/ DXA method. Conclusions: Accurate and inexpensive estimates of [DELTA]EI that are s comparable to the DLW/DXA method can be obtained by using a mathematical model and repeated body weight measurements. This trial was registered at clinicaltrials.gov as NCT00427193. Keywords: caloric restriction, dietary assessment, energy balance, energy intake, mathematical modeling, weight loss doi: 10.3945/ajcn.115.111070
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