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Effects of weight cycling caused by intermittent dieting on metabolic rate and body composition in obese women.



 
 
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Old June 17th, 2004, 02:19 AM
NR
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Default Effects of weight cycling caused by intermittent dieting on metabolic rate and body composition in obese women.

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Int J Obes 1991 May;15(5):367-74

Effects of weight cycling caused by intermittent dieting on metabolic rate
and body composition in obese women.

Jebb SA, Goldberg GR, Coward WA, Murgatroyd PR, Prentice AM.

MRC Dunn Clinical Nutrition Centre, Cambridge, UK.

The effects of repeated periods of weight loss and regain on metabolic rate
and body composition were investigated in 11 obese women (mean weight 81.98
kg, height 1.61 m, body mass index 31.44 kg/m2) studied for 18 weeks
through three consecutive cycles of 2 weeks dieting followed by 4 weeks ad
libitum eating. Weight loss was achieved by a very low energy diet
(1861kJ/day). Basal metabolic rate (BMR) was measured by whole-body
indirect calorimetry and body composition by a variety of standard in vivo
methods. During the three diet periods mean weight losses were 4.44, 3.29
and 2.98 kg although the mean overall weight loss from week 0 to 18 was
only 5.93 kg. The proportion of weight lost as fat was estimated as between
67 and 105 per cent of the weight lost depending on the body composition
methodology employed. Absolute BMR decreased in response to dieting by 545,
285 and 286 kJ/day. When corrected for body weight and FFM only the
decreases in the first diet period were significant (P less than 0.05 and P
less than 0.001 respectively). BMR had returned to normal following each
4-week ad libitum period and by the end of the study absolute BMR and
BMR/kg FFM had not changed significantly, despite a significant loss of
weight. Consequently BMR/kg was increased (P less than 0.01), indicative of
the loss of adipose tissue. We have found no evidence in this group of
obese women that weight cycling leads to a progressive decrease in BMR or
increase in the proportion of body fat.



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