Metabolic and anthropometric changes in female weight cyclers and controls over a 1-year period.

OBJECTIVE

Women who diet to lose weight often regain the weight over time, and the cycle repeats itself. The objective of this study was to identify a group of female weight cyclers and to match them with a control group who had never consciously tried to lose weight. For 1 year, weight patterns, eating habits, metabolic parameters, and body composition were assessed to determine whether there was a relationship between weight cycling and these variables.

DESIGN

Measurements were done at baseline and at 6 and 12 months. Changes in weight, diet, and exercise were monitored throughout the year.

SETTING

All testing was done at a university physiology laboratory.

SUBJECTS/SAMPLES: Nine weight cyclers with a notable history of dieting and food restriction were recruited. Subsequently, nine control subjects were selected and matched for age, height, weight, lean body mass, and exercise habits.

MAIN OUTCOME MEASURE

The observational study included measures of 3-day diet records, skinfold and girth, serum glucose, insulin and triiodothyronine, and resting energy expenditure.

STATISTICAL ANALYSES PERFORMED

The main variables were analyzed using a 2 x 3 (diet group x time) analysis of variance with repeated measures on the time factor. Comparison of the means was done by Tukey post hoc test.

RESULTS

A 7-point satisfaction scale indicated that the weight cyclers were dissatisfied with their weight compared with the noncyclers (P = .03). Otherwise, there were no differences between groups in dietary intakes or the physiologic variables.

APPLICATIONS/CONCLUSIONS: In the parameters measured, a history of weight cycling did not affect the metabolic profiles of the weight cyclers compared with the noncyclers.