The eating behavior of obese and nonobese women

Sixty-one obese, normal weight and thin women were observed for 30 minutes as they consumed a free-choice lunch in a quasi-naturalistic setting. Their behavior was unobtrusively quantified in terms of microbehavior (mouthfulls, chews, drinks and pauses) and of the macrobehavior (type and amount of food consumed and total active eating or drinking time). Information on subject and environmental variables are also reported. Observed behavior was analyzed as comparative group totals and as patterns of behavior over time. Comparison of group totals showed that: (a) there were no differences in types of food or number of calories consumed between the three groups, (b) no differences were found between the eating behavior of the normal weight and the obese and (c) the obese women spent less time actively eating, less time chewing and more time drinking than did the thinnest group. Pattern analysis revealed a decrease in all responses over time but showed no significant pattern difference between groups.     

Intrameal eating patterns of obese and nonobese humans.

Two experiments were conducted to test whether the intrameal eating patterns of obese and normal-weight human subjects are different. The first experiment was conducted in a laboratory under the pretense of a taste test. Eating was observed and data were compiled for seven parameters related to eating. The second experiment was conducted under field-study conditions with the subjects unaware of their participation. Few statistically significant differences in eating behavior were observed between obese and normal-weight subjects. These results are in contrast to the majority of previous work.     

Subjective equality and just noticeable differences in body-size judgments by obese persons

Body-size estimates by obese and normal-weight subjects were compared using two different procedures with a TV-video methodology. In the continuous method subjects adjusted an image larger or smaller until they judged a correct TV-image had been achieved. In the second procedure the method of constant stimuli was used wherein values corresponding to the point of subjective equality (PSE) and difference threshold (DL) were determined. No differences between obese and normal-weight subjects were obtained with these procedures. On the continuous task subjects slightly underestimated body size and were more accurate on descending trials where they adjusted the size of the image downwards. With the second procedure, an average PSE of -.62% was obtained, with an average DL = 7.27%. Different PSE values were obtained when subjects were judging whether their image was distorted too wide or too thin. Data from the two procedures are compared and ramifications for the study of body size are discussed.     

A factor analytic method for investigating differences between groups of individual learning curves

In this method of analyzing learning data, entire learning curves are described quantitatively by single numbers which are used in a statistical test to determine whether two or more groups of learning curves are significantly different. The method has some logical advantages over prevailing methods in that it avoids the use of average learning curves and of arbitrary measures of slope and asymptote. Its disadvantage is computational. Since it involves the use of factor analytic procedures, it may be tedious to apply unless computation is carried out on a high-speed computer.This investigation was begun and carried out for the most part while the author was a Psychometric Fellow of Educational Testing Service at Princeton University. It was completed at University College, London, during successive tenures of post-doctoral fellowships from The National Institute of Mental Health, U.S.P.H.S., and The National Science Foundation. Data for the numerical example were processed by the high-speed computer facilities of the Western Data Processing Center, Los Angeles.     

Psychological stress and glucose metabolism in obese and normal-weight subjects: a possible mechanism for differences in stress-induced eating

Acute psychological stress has been found to impair the handling of a glucose load in normal-weight individuals and to produce a delay in gastrointestinal transit time. The present study utilized the same paradigm to compare 10 obese and 10 normal-weight subjects. All subjects participated in two counterbalanced sessions (stress and nonstress). At each session, subjects were fed a carbohydrate load, and glucose was measured 0, 30, 60, 90, and 120 min after the load. On nonstress days, subjects relaxed after the drink; on stress days, subjects participated in 30 min of competitive tasks. The stressor significantly delayed the glucose response in the normal-weight subjects but did not affect the glucose response in obese subjects. This finding may have implications for differences between obese and normal-weight individuals in stress-induced eating, possibly explaining the decreased consumption of normal-weight individuals during stress.     

高低创造性思维水平者定向遗忘效应的差异研究

采用单字法定向遗忘范式,考察远距离联想任务得分高低者在中性和负性词语定向遗忘效应上的差异,来探讨创造性思维水平高低与主动抑制的关系。实验采用2(高/低创造性思维水平)×2(中性/负性词汇)×2(记住/忘记指令)×2(2s/5s时间间隔)混合设计,发现高低创造力组,在材料不同呈现时间下,对不同情绪材料的定向遗忘效应分别不同。低创者在2s和5s以及高创者在5s时间间隔时,均对中性词语表现出定向遗忘效应,而对负性词汇没有表现出明显的定性遗忘效应。高创者在2s时间间隔下,对中性和负性词语均表现出定向遗忘效应。结果表明较短时间内高创者对负性情绪的主动抑制能力优于低创者。     

Effect of calories on appetite for palatable food in obese and nonobese humans.

Palatable food stimuli were presented to 11 obese and 11 nonobese male human subjects (in three experiments) 1 hr after ingestion of 900-calorie liquid lunches and (on separate days) indentically tasting 450-calorie liquid lunches of equal volume. Salivary responses to the presentation of the stimuli (i.e., appetite) by the nonobese were inhibited by the high-calorie meal, but those by the obses were less inhibited. Hunger ratings were unaffected by calories in either group. Food stimuli were rated as more appetizing by the nonobese after high-calorie meals, but not so by the obese. Parallels with animal findings suggest that salivary responses reflect lateral hypothalamic activity.     

Differential association between food craving,food addiction and eating-related characteristics in persons at risk for eating disorders

IntroductionFood craving is a key feature of eating disorders, but its association with medical and psychological outcome might depend on the type of eating disorder.ObjectivesThis study investigated the factors associated with food craving in individuals at risk for DSM-5 eating disorder.MethodSeventy-six women were recruited from a non-clinical population (n = 372) based on their positive screening (EDDS, QEWP-R) for binge eating disorder (BED; n = 29), anorexia nervosa (AN; n = 28) or bulimia nervosa (BN; n = 19). They completed self-administered questionnaires assessing food craving (FCQ- T-r), Body Mass Index (BMI), eating behaviour (DEBQ), food addiction (YFAS 2.0), and anxiety and depressive symptoms (HADS).ResultsIndividuals at risk for BED or BN had higher food craving than those at risk for AN. Food craving was associated with BMI only in the BED group. Food craving was positively correlated with external eating in all groups, and with emotional eating in the AN and BED groups and correlated with anxiety only in BN. Food addiction prevalence was higher in the BN group than in the AN or BED groups (respectively 94.7%, 46.4% and 65.5%; p < 0.01). In this non-clinical population, we demonstrated that food craving was differentially associated with BMI and eating-related characteristics according to the type of eating disorder.ConclusionThis suggests that food craving is a transdiagnostic dimension that should be differentially targeted depending on the type of eating disorder; future studies should test this hypothesis in clinical populations.     

Loss of control over eating in obese youngsters

OBJECTIVE: To investigate loss of control over eating in a sample of obese youngsters seeking treatment. METHOD: Obese youngsters (aged 10-16) were categorized into those having experienced loss of control (LC) and those who had not (NoLC) using the child version of the Eating Disorder Examination. Furthermore, the LC group was subdivided into an objective binge eating (OBE) and a subjective binge eating (SBE) group. The groups were compared on psychological measures. RESULTS: LC subjects (17.9%) showed more concern about eating, weight and shape. They also reported more emotional and external eating behaviors and more depression. Youngsters who report SBE show resemblances to both NoLC and OBE subjects. DISCUSSION: LC subjects are characterized by more eating-related psychopathology and higher levels of depression. Especially obese youngsters with OBE turned out to be a pathological group.     

Comparison of self-concept of nonobese and obese university junior female nursing students

Obesity appears to be one of today's most common health problems. Its incidence has doubled in the past 75 years (Waxler & Leef, 1969), and it is estimated that 45 million Americans are obese (body weight 15% over ideal weight). There also seems to be preoccupation with dieting, as evidenced by the proliferation of weight-control devices and schemes. It has been noted that depression, distorted body image, problems in peer and family relations, and poor school performance are evident among the obese (Bowers, Faulkner, & Michel, 1979). The literature is replete with evidence of body image distortion in obesity. Among the factors contributing to this distortion are age of onset, presence of emotional disturbance, and negative evaluation of the obese person by significant others (Wineman, 1980). Since body image is an important concept, perhaps movement can be made to other areas of self-concept, such as family, social, identity, and personal conceptions of selfhood. The purpose of this study is to provide information about the total self-concept of obese students as compared to nonobese students in a junior nursing class. A determination is made of the relationships between self-concept and variables of obesity, age of onset, and social class. Implications for nursing care are described.     

A computerized task for investigating the relation between attentional and emotional processes in children

The authors' goals in this article are to (a) describe a new task for the assessment of shifting attention between different affective stimuli, The Children's Attentional Shifting Task (CAST); (b) present the theoretical background for the development of the CAST; and (c) report initial information on the developmental appropriateness and validity of the CAST. The task was tested using a sample of kindergarten and 1st-grade children, 50% of whom had social and conduct problems. Preliminary analyses showed that the CAST was not subject to problems arising from fatigue or loss of interest. Moreover, children's ability to shift attention away from angry facial expressions was positively related to teachers' ratings of their ability to shift attention and parents' reports of children's emotion regulation. Shifting away from negative affect also predicted children's academic performance as reported by teachers.     

Gender differences in eating behavior and body weight regulation

Gender differences in food intake and selection first appear in adolescence. Men consume more calories than women, and the sexes have different eating styles, which indicate that women have been socialized to eat in a more feminine manner. Women experience more food-related conflict than men do, in that they like fattening foods but perceive that they should not eat them. Pressures to be thin are present in early adolescence, as noted by dieting behavior starting in very young girls. Women experience more dissatisfaction with their body weight and shape than men do. Sociocultural and psychological factors may be important in the etiology of eating disorders, which are much more prevalent in females than in males. Thus, further studies of gender differences in eating behavior will be important for understanding the etiology of eating and body-weight disorders and for designing gender-appropriate treatments.     

A research strategy for investigating group differences in a cognitive construct: Application to ageing and executive processes

A strategy involving five distinct phases is proposed as a means of obtaining the most informative evidence about group differences in a particular aspect of cognitive functioning. Perhaps because the phases require different types of analytical methods, most prior research has focused on only a few of the proposed phases. This is unfortunate because each phase provides valuable information about the nature of the relevant construct, and its role in group differences in cognition. The strategy is illustrated with research on adult age differences in executive processes.     

Commonalities and differences in characteristics of persons at risk for narcissism and mania

Clinicians have long noted overlap in some of the key features of narcissism and bipolar disorder, including excessively high goals and impulsivity. In addition, empirical findings consistently document high levels of comorbidity between the two conditions. To better understand the similarities and differences in psychological qualities associated with mania- and narcissism-related vulnerabilities, we administered to 233 undergraduates a broad range of measures pertaining to goals and affects (both their experience and their dysregulation) and impulsivity. As hypothesized, tendencies toward both narcissism and hypomania related to elevations on measures of affective and goal dysregulation. In addition, hypomania tendencies were related to higher impulsivity, but that association did not appear for narcissistic tendencies. Results highlight key commonalities and differences between those at risk for mania versus narcissism. Future research should examine these relationships in clinically diagnosed samples.     

Level of object representation and psychic structure deficit in obese persons

The structural deficit and external regulation hypotheses of addiction state that addicts do not have adequate psychic structure with which to regulate painful affects internally. They instead use their drug of choice as an external regulator to self-medicate painful affects. This study tests whether the hypotheses can be applied to obese persons, for whom food may be the drug of choice. The level of object representation of 22 moderately obese and 24 normal weight subjects was compared using the Blatt Family Interaction Questionnaire. The mean level of object representation of both parents was lower for the obese subjects than for the normal-weight subjects. This finding supports the structural deficit and external regulation hypotheses of food addiction.