Eating control and physical activity as determinants of short-term weight maintenance after a very-low-calorie diet among obese women.

OBJECTIVE

To test the hypothesis that eating control and physical activity help maintain weight and waist circumference after a very-low-calorie diet.

DESIGN

A 12 week weight reduction (WR) phase, followed by a 40 week weight maintenance (WM) phase. For the latter, the subjects were randomised into a no-exercise group and one of two groups with a walking program.

SUBJECTS

Eighty-five obese (body mass index 29-46, mean 34), clinically healthy, premenopausal women.

MEASUREMENTS

Body weight, waist circumference, body composition, the measuring restrained eating, disinhibition and hunger, measured by Three Factor Eating Questionnaire (TFEQ), binge eating measured by the Bulimic Investigatory Test of Edinburgh (BITE), and number of daily steps measured by a pedometer.

RESULTS

The change (delta) in weight during WM was predicted by the following regression: deltaweight (kg)=5.23+0.45 deltaweight during WR+0.66 disinhibition during WM0.00039 daily steps during WM, r2=0.46, SEE 3.3 kg. The change in waist circumference during WM was predicted as deltawaist (cm)=0.76+0.75 deltaweight during WM0.00021 daily steps during WM, r2=0.67, SEE 2.6 cm. Exercise group assignment did not affect the changes in weight, waist circumference, or indicators of eating control during the maintenance program.

CONCLUSIONS

Control of overeating, as indicated by a lower disinhibition factor of the TFEQ, and daily physical activity, as indicated by a higher number of daily steps, were positive and independent predictors of weight maintenance after a very-low-calorie diet. The number of daily steps showed an independent association with change in waist circumference during weight maintenance, even after adjustment for weight change.