Appetite
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Randomized Controlled Trial
Acute effect of walking on energy intake in overweight/obese women.
This study examined the acute effect of a bout of walking on hunger, energy intake, and appetite-regulating hormones [acylated ghrelin and glucagon-like peptide-1 (GLP-1)] in 19 overweight/obese women (BMI: 32.5 ± 4.3 kg/m²). Subjects underwent two experimental testing sessions in a counterbalanced order: exercise and rest. Subjects walked at a moderate-intensity for approximately 40 min or rested for a similar duration. ⋯ None of these variables were associated with energy intake. In conclusion, hunger and energy intake were unaltered by a bout of walking suggesting that overweight/obese individuals do not acutely compensate for the energy cost of the exercise bout through increased caloric consumption. This allows for an energy deficit to persist post-exercise, having potentially favorable implications for weight control.
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The purpose of the study was to make a systematic review and describe and confront recent studies that compare the presence of disordered eating and its complications in young female athletes and controls subjects - PubMed, Scielo, Medline, ScienceDirect, WILEY InterScience, Lilacs and Cochrane were the databases used for this review. Out of 169 studies 22 were selected and 11,000 women from 68 sports were studied. The short version of the EAT was the most common instrument used to track disordered eating. ⋯ Also a higher percentage of studies reported higher frequency of menstrual dysfunction in athletes than controls and finally 50% of the studies found incidence of low bone mass in controls. Not all the studies that investigated all the conditions in the triad, but the authors concluded that it seemed that athletes were in more severe stage of this disorder. Due to the heterogeneity of the studies, a definitive conclusion about the groups and at highest risk for disordered eating and its complications remains to be elucidated.
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Comparative Study
Eat it or beat it. The differential effects of food temptations on overweight and normal-weight restrained eaters.
Dieting is difficult to maintain in an environment where cues of attractive, high-calorie food abound. Overweight and restrained eating have been associated with failures of self-regulation in response to such food cues. A subgroup of successful restrained eaters, however, have been found to activate their dieting goal in response to tempting food cues, which helps them to pursue their dieting goal in such situations. ⋯ Next, wanting for high-calorie snacks was assessed with a forced-choice measure presenting pictures of high-calorie snacks and low-calorie alternatives. As predicted, exposure to attractive food cues decreased wanting for high-calorie food in normal-weight restrained eaters, but increased wanting in overweight restrained eaters. These results suggest that, in women who are successful in maintaining their weight, food temptations may trigger processes of successful self-regulation, whereas overweight restrained eaters may seem to forget about their diet goal when they are confronted with attractive food, thereby risking the chance to overeat.
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Randomized Controlled Trial
Influence of prolonged treadmill running on appetite, energy intake and circulating concentrations of acylated ghrelin.
The effects of prolonged treadmill running on appetite, energy intake and acylated ghrelin (an appetite stimulating hormone) were examined in 9 healthy males over the course of 24h. Participants completed 2 experimental trials (exercise and control) in a randomised-crossover fashion. In the exercise trial participants ran for 90 min at 68.8 + or - 0.8% of maximum oxygen uptake followed by 8.5 h of rest. ⋯ Exercise transiently suppressed appetite and acylated ghrelin but each remained no different from control values in the hours afterwards. Furthermore, despite participants expending 5324 kJ during exercise there was no compensatory increase in energy intake (24 h energy intake; control 17,191 kJ, exercise 17,606 kJ). These findings suggest that large energy deficits induced by exercise do not lead to acute compensatory responses in appetite, energy intake or acylated ghrelin.
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This questionnaire study assessed people's consumption intentions regarding two pack king size chocolate bars. Results showed that 92.9% of the respondents (n=143) intended to finish the chocolate bar within 1 day. ⋯ Furthermore, dietary restraint reduced the odds of a respondent intending to finish the two pack king size chocolate bar within 1 day. Based on the results, the availability and visibility of regular chocolate bars and healthier snacks should be increased, and consumers should be educated about the impact of portion sizes of high caloric snacks.