Changes in body composition and fat distribution in response to weight loss and weight regain

K. van der Kooy

Research output: Thesisinternal PhD, WU

Abstract

<p>This thesis describes the effects of weight loss and subsequent weight regain on body composition, fat distribution and resting energy expenditure in moderately obese men and moderately obese premenopausal women. Participants were subjected to a controlled 4.2 MJ/day energy deficit diet for 13 weeks, and re-examined more than one year after weight loss intervention. Five techniques to assess the changes in body composition after weight loss (on average 12.2 ± 3.7 kg (mean ± SD)) were compared. The results from densitometry (hydrostatic weighing) and the deuterium oxide dilution technique were similar, whereas, bioelectrical impedance and two anthropometric methods (skinfold thicknesses and body mass index) showed larger reductions in fat-free mass (FFM) than estimated by densitometry and the dilution technique. These findings were similar in both sexes. Magnetic resonance imaging (MRI) was used to assess the reductions after weight loss in the visceral and subcutaneous abdominal fat depots and the subcutaneous fat depot at trochanter level. The proportional reduction of fat was largest in the visceral depot (men 40%, women 33%) and less fat was lost subcutaneously, especially at trochanter level (men 29%, women 26%). The reductions in visceral fat as measured by MRI were compared with changes in anthropometric measurements. The change in waist-to-hip ratio (WHR) was not related to the change in visceral fat, and the change in sagittal-to-transverse abdominal diameter ratio was only moderately associated with visceral fat loss in both sexes. During the follow-up of 67 weeks after weight loss, 80% of the weight lost was regained on average. In men but not in women, the reduction in resting metabolic rate (RMR) after weight loss was larger than expected from the losses of FFM and fat mass. The RMR returned to baseline level in both sexes after weight regain. The reduction in RMR was not related to later weight regain. Percentage body fat and amount of visceral fat also nearly returned to the level similar to that before weight loss.<p>It is concluded that bioelectrical impedance and anthropometric measurements are not as good as densitometry or the deuterium-oxide dilution method for the evaluation of changes in body composition. Only approximate estimates of visceral fat can be achieved by anthropometry. As a consequence, the assessment of changes in visceral fat by anthropometry is limited. Finally, one weight cycle as observed in this study does not lead to a permanently reduced RMR, nor to a greater body fatness nor to an increase in visceral fat compared with initial levels.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • Hautvast, J.G.A.J., Promotor
  • Deurenberg, P., Promotor, External person
  • Seidell, J.C., Promotor, External person
Award date28 Apr 1993
Place of PublicationS.l.
Publisher
Print ISBNs9789054850991
Publication statusPublished - 1993

Fingerprint

Body Fat Distribution
Intra-Abdominal Fat
Body Composition
Weight Loss
Weights and Measures
Basal Metabolism
Fats
Densitometry
Deuterium Oxide
Indicator Dilution Techniques
Anthropometry
Electric Impedance
Femur
Magnetic Resonance Imaging
Abdominal Subcutaneous Fat
Abdominal Muscles
Skinfold Thickness
Waist-Hip Ratio
Subcutaneous Fat
Energy Metabolism

Keywords

  • obesity
  • overweight
  • nutrition
  • fats
  • biometry
  • energy requirements
  • food hygiene
  • nutritional state
  • consumption patterns
  • adipose tissue

Cite this

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title = "Changes in body composition and fat distribution in response to weight loss and weight regain",
abstract = "This thesis describes the effects of weight loss and subsequent weight regain on body composition, fat distribution and resting energy expenditure in moderately obese men and moderately obese premenopausal women. Participants were subjected to a controlled 4.2 MJ/day energy deficit diet for 13 weeks, and re-examined more than one year after weight loss intervention. Five techniques to assess the changes in body composition after weight loss (on average 12.2 ± 3.7 kg (mean ± SD)) were compared. The results from densitometry (hydrostatic weighing) and the deuterium oxide dilution technique were similar, whereas, bioelectrical impedance and two anthropometric methods (skinfold thicknesses and body mass index) showed larger reductions in fat-free mass (FFM) than estimated by densitometry and the dilution technique. These findings were similar in both sexes. Magnetic resonance imaging (MRI) was used to assess the reductions after weight loss in the visceral and subcutaneous abdominal fat depots and the subcutaneous fat depot at trochanter level. The proportional reduction of fat was largest in the visceral depot (men 40{\%}, women 33{\%}) and less fat was lost subcutaneously, especially at trochanter level (men 29{\%}, women 26{\%}). The reductions in visceral fat as measured by MRI were compared with changes in anthropometric measurements. The change in waist-to-hip ratio (WHR) was not related to the change in visceral fat, and the change in sagittal-to-transverse abdominal diameter ratio was only moderately associated with visceral fat loss in both sexes. During the follow-up of 67 weeks after weight loss, 80{\%} of the weight lost was regained on average. In men but not in women, the reduction in resting metabolic rate (RMR) after weight loss was larger than expected from the losses of FFM and fat mass. The RMR returned to baseline level in both sexes after weight regain. The reduction in RMR was not related to later weight regain. Percentage body fat and amount of visceral fat also nearly returned to the level similar to that before weight loss.It is concluded that bioelectrical impedance and anthropometric measurements are not as good as densitometry or the deuterium-oxide dilution method for the evaluation of changes in body composition. Only approximate estimates of visceral fat can be achieved by anthropometry. As a consequence, the assessment of changes in visceral fat by anthropometry is limited. Finally, one weight cycle as observed in this study does not lead to a permanently reduced RMR, nor to a greater body fatness nor to an increase in visceral fat compared with initial levels.",
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author = "{van der Kooy}, K.",
note = "WU thesis 1617 Proefschrift Wageningen",
year = "1993",
language = "English",
isbn = "9789054850991",
publisher = "Van der Kooy",

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Changes in body composition and fat distribution in response to weight loss and weight regain. / van der Kooy, K.

S.l. : Van der Kooy, 1993. 123 p.

Research output: Thesisinternal PhD, WU

TY - THES

T1 - Changes in body composition and fat distribution in response to weight loss and weight regain

AU - van der Kooy, K.

N1 - WU thesis 1617 Proefschrift Wageningen

PY - 1993

Y1 - 1993

N2 - This thesis describes the effects of weight loss and subsequent weight regain on body composition, fat distribution and resting energy expenditure in moderately obese men and moderately obese premenopausal women. Participants were subjected to a controlled 4.2 MJ/day energy deficit diet for 13 weeks, and re-examined more than one year after weight loss intervention. Five techniques to assess the changes in body composition after weight loss (on average 12.2 ± 3.7 kg (mean ± SD)) were compared. The results from densitometry (hydrostatic weighing) and the deuterium oxide dilution technique were similar, whereas, bioelectrical impedance and two anthropometric methods (skinfold thicknesses and body mass index) showed larger reductions in fat-free mass (FFM) than estimated by densitometry and the dilution technique. These findings were similar in both sexes. Magnetic resonance imaging (MRI) was used to assess the reductions after weight loss in the visceral and subcutaneous abdominal fat depots and the subcutaneous fat depot at trochanter level. The proportional reduction of fat was largest in the visceral depot (men 40%, women 33%) and less fat was lost subcutaneously, especially at trochanter level (men 29%, women 26%). The reductions in visceral fat as measured by MRI were compared with changes in anthropometric measurements. The change in waist-to-hip ratio (WHR) was not related to the change in visceral fat, and the change in sagittal-to-transverse abdominal diameter ratio was only moderately associated with visceral fat loss in both sexes. During the follow-up of 67 weeks after weight loss, 80% of the weight lost was regained on average. In men but not in women, the reduction in resting metabolic rate (RMR) after weight loss was larger than expected from the losses of FFM and fat mass. The RMR returned to baseline level in both sexes after weight regain. The reduction in RMR was not related to later weight regain. Percentage body fat and amount of visceral fat also nearly returned to the level similar to that before weight loss.It is concluded that bioelectrical impedance and anthropometric measurements are not as good as densitometry or the deuterium-oxide dilution method for the evaluation of changes in body composition. Only approximate estimates of visceral fat can be achieved by anthropometry. As a consequence, the assessment of changes in visceral fat by anthropometry is limited. Finally, one weight cycle as observed in this study does not lead to a permanently reduced RMR, nor to a greater body fatness nor to an increase in visceral fat compared with initial levels.

AB - This thesis describes the effects of weight loss and subsequent weight regain on body composition, fat distribution and resting energy expenditure in moderately obese men and moderately obese premenopausal women. Participants were subjected to a controlled 4.2 MJ/day energy deficit diet for 13 weeks, and re-examined more than one year after weight loss intervention. Five techniques to assess the changes in body composition after weight loss (on average 12.2 ± 3.7 kg (mean ± SD)) were compared. The results from densitometry (hydrostatic weighing) and the deuterium oxide dilution technique were similar, whereas, bioelectrical impedance and two anthropometric methods (skinfold thicknesses and body mass index) showed larger reductions in fat-free mass (FFM) than estimated by densitometry and the dilution technique. These findings were similar in both sexes. Magnetic resonance imaging (MRI) was used to assess the reductions after weight loss in the visceral and subcutaneous abdominal fat depots and the subcutaneous fat depot at trochanter level. The proportional reduction of fat was largest in the visceral depot (men 40%, women 33%) and less fat was lost subcutaneously, especially at trochanter level (men 29%, women 26%). The reductions in visceral fat as measured by MRI were compared with changes in anthropometric measurements. The change in waist-to-hip ratio (WHR) was not related to the change in visceral fat, and the change in sagittal-to-transverse abdominal diameter ratio was only moderately associated with visceral fat loss in both sexes. During the follow-up of 67 weeks after weight loss, 80% of the weight lost was regained on average. In men but not in women, the reduction in resting metabolic rate (RMR) after weight loss was larger than expected from the losses of FFM and fat mass. The RMR returned to baseline level in both sexes after weight regain. The reduction in RMR was not related to later weight regain. Percentage body fat and amount of visceral fat also nearly returned to the level similar to that before weight loss.It is concluded that bioelectrical impedance and anthropometric measurements are not as good as densitometry or the deuterium-oxide dilution method for the evaluation of changes in body composition. Only approximate estimates of visceral fat can be achieved by anthropometry. As a consequence, the assessment of changes in visceral fat by anthropometry is limited. Finally, one weight cycle as observed in this study does not lead to a permanently reduced RMR, nor to a greater body fatness nor to an increase in visceral fat compared with initial levels.

KW - obesitas

KW - overgewicht

KW - voeding

KW - vetten

KW - biometrie

KW - energiebehoeften

KW - voedselhygiëne

KW - voedingstoestand

KW - consumptiepatronen

KW - vetweefsel

KW - obesity

KW - overweight

KW - nutrition

KW - fats

KW - biometry

KW - energy requirements

KW - food hygiene

KW - nutritional state

KW - consumption patterns

KW - adipose tissue

M3 - internal PhD, WU

SN - 9789054850991

PB - Van der Kooy

CY - S.l.

ER -