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PubMedDate not supplied

Metformin as treatment for overweight and obese adults: a systematic review.

PURPOSE: We wanted to determine whether metformin is an effective medication for treatment of overweight or obese adults who do not have diabetes mellitus or polycystic ovary syndrome (PCOS). METHODS: We searched MEDLINE (1966-2003), EMBASE (1986-2003), Allied and Complementary Medicine Database (1985-2003), International Pharmaceutical Abstracts (1970-2003), the Cochrane Library, American College of Physicians Journal Club, Database of Abstracts of Reviews of Effects, Cochrane Controlled Trials Register, MEDLINE In-Process & Other Non-Indexed Citations, reference lists of retrieved articles, and articles by selected authors and pharmaceutical manufacturers. Inclusion criteria were being obese or overweight determined by a BMI of 25 kg/m2 or greater or waist-to-hip ratio (WHR) of more than 0.8, metformin use, and aged 18 years or older. Exclusion criteria were a diagnosis of diabetes mellitus, polycystic ovarian syndrome or descriptors of polycystic ovarian syndrome, human immunodeficiency virus infection, and concomitant antipsychotic medications. Trials were graded on an 11-point Jadad scale. Only randomized controlled and blinded trials were accepted. Two reviewers independently extracted data from each trial. Primary outcomes measured were changes in BMI, WHR, and weight. RESULTS: Fifty-seven potentially relevant studies were initially identified; 48 were excluded because of lack of randomization, lack of blinding, failure to meet inclusion or exclusion criteria, inaccessible outcomes, or improper study design. Nine clinical trials met criteria for validity assessment. Four studies used the parameter of waist-to-hip ratio, 3 studies included BMI, and 8 used weight. Two of the 9 studies showed a small reduction in WHR. CONCLUSION: Insufficient evidence exists for the use of metformin as treatment of overweight or obese adults who do not have diabetes mellitus or polycystic ovary syndrome. Further studies are needed to answer this clinical question.

Adult↗
PubMed2005

Children's residential weight-loss programs can work: a prospective cohort study of short-term outcomes for overweight and obese children.

OBJECTIVE: The evidence base for child obesity treatment is weak. Children's weight-loss camps, despite their popularity, have not been properly evaluated. This study evaluated the effectiveness of a residential weight-loss camp program for overweight and obese children. METHODS: A total of 185 overweight children (mean age: 13.9 years) enrolled in 1 of 4 consecutive programs between 1999 and 2002 (intervention group) were compared with 94 children of similar ages who were not camp attendees, ie, 38 overweight children and 56 normal-weight children. The intervention group attended a 6-week (maximum) summer residential weight-loss camp. The program included a daily schedule of six 1-hour, skill-based, fun, physical activity sessions, moderate dietary restriction, and group-based educational sessions. All children were assessed for body weight, height, and other anthropometric measures, blood pressure, aerobic fitness, self-esteem, and selected sports skills. RESULTS: Campers, who stayed for a mean of 29 days, lost 6.0 kg, reduced their BMI by 2.4 units, and reduced their BMI SD scores by 0.28. Fat mass decreased significantly (from 42.7 to 37.1 kg), whereas fat-free mass did not change. In contrast, both comparison groups gained weight during this period. Camp attendees also showed significant improvements in blood pressure, aerobic fitness, and self-esteem. Longer durations of stay were associated with greater improvements in outcomes. CONCLUSIONS: In the short term at least, this weight-loss program was effective across a range of health outcomes. Ongoing research is examining the maintenance of these improvements. Future research should investigate whether benefits can be generalized across weight-loss camps and how the intervention can be adapted to nonresidential, term-time settings.

Adolescent↗
PubMed2006

[Nationwide multicenter study on the prevalence of overweight and obesity in type 2 diabetes mellitus in the Brazilian population].

AIM: To evaluate the prevalence of overweight and obesity in type 2 diabetic (DM2) outpatients from different regions of Brazil. PATIENTS AND METHODS: We studied 2,519 randomly selected patients, from 11 hospitals, 2 endocrine and one general public care clinics from 10 cities. Overweight was defined as body-mass index (BMI) > 25 and obesity as BMI > 30 kg/m2. Glycemic control (GC) was evaluated by GC index (GCI = patient's HbA1 or HbA1c/upper limit of normal for the method x 100). RESULTS: 39% of the population studied was male, the mean age was 58.8 +/- 11.6 y, the duration from clinical diagnosis of DM2 was 9.0 +/- 7.3y, and BMI was 28.3 +/- 5.2 kg/m2. No measurements of BMI were recorded from 265 patients (10.5%). Patients from the Northeast presented lower BMI as compared with those from the Midwest, Southeast and South areas, respectively (26.4 +/- 4.7 vs. 27.9 +/- 4.8 vs. 29.2 +/- 5.1 vs. 29.4 +/- 5.4 kg/m2; p < 0.001). A greater prevalence of obesity was observed in the Southeast and South areas as compared to the Northeast (p < 0.001), as well as in the female group, respectively (69% vs. 31%; p < 0.001). Normal weight patients presented lower GCI. Patients being treated with two or more oral drugs and an association of insulin plus oral drug presented greater BMI values than those being treated with diet, oral hypoglycemic agents and insulin p < 0.001. The BMI of patients treated by a specialist did not differ from those treated by a generalist. CONCLUSIONS: 75% of our sample was out of adequate BMI and 30% was obese. The percentage of patients with overweight and obesity was comparable to those found in similar European studies but still lower than those found in the USA. The prevalence of obesity in diabetic patients was three times higher than in the overall Brazilian population according to data from the Brazilian Institute of Geography and Statistics (IBGE).

Adult↗
PubMed2006

[Birth weight and overweight in childhood: a systematic review].

Birth weight is associated with overweight and obesity in childhood. However, results are controversial. The aim of this systematic review is to identify concordant and contradictory aspects on the association between birth weight and overweight in children up to seven years of age. The first eight articles were selected in a previous review evaluating risk factors for childhood obesity. The search in PubMed between 1993 and 2004, using keywords "birth weight AND childhood", "obesity" and "overweight", together with the previous ones added up to 20 papers conforming the review criteria. Despite the studies' heterogeneity, a positive association between birth weight and some kind of childhood obesity was predominant among the published papers. Meanwhile, the inconsistency of some aspects related to birth weight and childhood obesity suggests the need for an approach allowing the inclusion of some context effects on the childhood obesity risk factors framework.

Birth Weight↗
PubMed2006

Relationship of serum interleukin-6 and tumor necrosis factor alpha levels with abdominal fat distribution evaluated by ultrasonography in overweight or obese postmenopausal women.

BACKGROUND: The objective of this study was to measure associations of circulating interleukin-6 (IL-6) and tumor necrosis factor alpha (TNF-alpha) levels with anthropometric and abdominal fat distribution in overweight or obese postmenopausal women. METHODS: One hundred eight overweight or obese postmenopausal were evaluated. Demographic and anthropometric measurements were done. Serum IL-6, TNF-alpha, glucose, and insulin levels were measured. Insulin resistance was calculated by using homeostasis model assessment-insulin resistance (HOMA-IR). The assessment of abdominal fat distribution was performed by ultrasonography. Statistical analysis was made with Pearson and partial correlation analysis. RESULTS: There was a positive correlation between serum IL-6 and TNF-alpha (r = .19; p = .047). IL-6 was positively correlated with body mass index (BMI) (r = .43; p = .0001), waist circumference (r = .41; p = .0001), and visceral fat layer (r = .33; p = .0001) measurements and HOMA-IR index (r = .31, p = .001). A positive relationship between HOMA-IR and visceral fat layer thickness was observed (r = .320; p = .0001). TNF-alpha was positively associated with BMI but not with any measures of central obesity. When adjustment for BMI was performed, there were no significant relationships between the studied parameters. CONCLUSIONS: There are no significant correlations between abdominal fat distributions measured by ultrasonography and circulating IL-6 and TNF-alpha levels. BMI may have a stronger association with circulating inflammatory cytokine concentrations than with different measures of central obesity in overweight or obese postmenopausal women.

Abdominal Fat↗
PubMed2005

[Metformin in the treatment of type 2 diabetes in overweighted or obese patients].

UNLABELLED: FUNDAMENTALS AND OBJECTIVES: [corrected] Diabetes is the disease that has suffered a greater increase in his incidence in the last years. Obesity is the most important risk factor to develop this disease and metformin is considered as a first line drug in overweighted diabetic patients. The aim of this study is to evaluate the use of metformin and the degree of control of the associated cardiovascular risk factors (CVRF) in patients suffering of type 2 diabetes and overweight or obesity. PATIENTS AND METHODS: This is a transversal descriptive study over a random chosen group of 308 patients followed at primary care level. They were classified in four different groups depending on the treatment used to control them (diet, insulin, metformin and other oral antidiabetic drugs). They were evaluated upon the degree of control of the modifiable CVRF, the presence of complications and the metabolic control. RESULTS: The average age was 69.6 years, 54% of the patients female. 36.6% followed treatment with metformin and 40.5% with sulfonylureas. The macrovascular percentage of affection was 19.4%. The most frequent CVRF was arterial hypertension (76%). The goal levels of control that were less in range were the levels of cLDL < 100 mg/dl and systolic blood pressure < 130 mmHg. Diabetic patients only treated with diet had a better control of fasten glycemia and HbA1c% than those ones treated with metformin (p < 0.001). The group treated with metformin showed levels of triglycerides (TG) significantly higher than those of the diet controlled group (p = 0.009) and insulin group (p < 0.001). CONCLUSIONS: Metformin and sulfonylureas are used in a similar proportion in type 2 diabetics with overweight or obesity. There is a poor control of the majority of the CVRF in the diabetic population studied.

Aged↗
PubMed2004

[Comparative study on different overweight reference applied on analyzing growth of Chinese children and adolescents].

The paper is studied based on anthropometry data collected in 1991 and 2000 in the China Health and Nutrition Survey, which is collaboration with the University of North Carolina at Chapel Hill. The sample are 7-18 years old children and adolescents. The primary purpose of this paper is to study the trends and prevalence of overweight and obesity among Chinese children and adolescents with different references and to compare the results and to further discuss their strengths and limits. The results from all the references indicate that overweight among Chinese children and adolescents are increasing sharply and becoming a problem that can't be overlooked. These references are not quite suitable for Chinese children and adolescents. Native age-sex-BMI references of overweight and obesity among Chinese children and adolescents should be established.

Adolescent↗
PubMed2005

Overweight among Kauai first-graders.

This 2003 study examined pre-school physical exam data on student health records of Kauai public school first-graders and found that 14.5% were at risk for overweight (between > or =85th and 94th percentile BMI-for-age), and 21.5% were overweight (>95 percentile BMI-for-age). The prevalence of overweight among Kauai students was twice that reported nationally for the same age group.

Body Mass Index↗
PubMed2004

Estimation of physical activity by different questionnaires in overweight subjects and patients with Type 2 diabetes mellitus: relationship with anthropometric and metabolic variables.

AIM: This study assessed the level of physical activity in overweight and obese subjects, and overweight and obese patients with Type 2 diabetes mellitus (T2DM). It also compared their physical activity level with that of the general population and investigated benefits of physical activity on anthropometric and metabolic parameters and blood pressure in the studied groups of patients using Baecke's questionnaire and the Lipid Research Clinics Physical Activity (LRC PA) questionnaire. The two questionnaires were also compared in the evaluation of benefits. METHODS: Physical activity level and other parameters (body weight, body height, body mass index, waist-to-hip ratio, systolic and diastolic blood pressure, lipoprotein and creatinine concentrations in the blood, concentration of fasting glucose and HbA1c in the blood, albuminuria-to-creatinuria ratio) of 136 subjects and their relationships were investigated during their out-patient visits. RESULTS: No difference in physical activity level was found among the four groups of investigated patients. The comparison between the level of physical activity in the investigated patients and the general population obtained by Baecke's questionnaire revealed a lower sports index in all groups of investigated men and obese women with diabetes mellitus. Our results confirm the benefit of physical activity on a high number of investigated parameters in the studied patients. The Baecke's questionnaire was found to estimate the effects of physical activity on metabolic and anthropometric parameters, as well as blood pressure, better than the LRC PA questionnaire, especially the two-point scoring system. CONCLUSIONS: LRC PA and especially Baecke's questionnaires are valuable aids in the estimation of physical activity level and its benefits in overweight and obese patients and patients with T2DM.

Adult↗
PubMed2005

[Three years follow-up study on the changes of overweight and obesity among 862 pre-school children in Beijing city].

OBJECTIVE: To study the trend of changes of overweight and obesity among pre-school children in Beijing city. METHODS: An epidemiological survey was conducted in 10 representative kindergartens in urban Beijing. 862 children who were 3 - 4 years old in the first survey in 2000 were followed in 2001 and 2002. Anthropometric included weight and height. RESULTS: The results from three years follow-up of 862 children indicated that the prevalence of overweight and obesity increased with the age increasing (P < 0.05). The prevalence of obesity of boys was 12.5% in 2002 which increase 8% than that in the year of 2000 (4.4%), and the prevalence of obesity of girls was 10.7% in the year of 2002 which increase 6% than that in the year of 2000 (4.2%), the increasing rate of the obesity group was fast than the normal group. 80 percent of the obesity children remained obesity during the three years and the incidence of the obesity during the normal group was lower than the overweight group.

Body Height↗
PubMed2005

Sleep study in patients with overweight and obesity.

Obstructive sleep apnea syndrome (OSAS) is a disorder characterized by repetitive collapse of the pharyngeal airway during sleep, which leads to oxygen desaturation, sleep fragmentation and daytime somnolence. Obesity is one of the most important risk factor for the development of OSAS. The exact mechanisms responsible for the relationship between obesity and OSAS are still unclear. The fat deposits in the pharynx region as well as the reduction in the lung volume have been considered as factors that might be responsible for the increase of the upper airway collapsibility. The aim of our study was to evaluate the correlation between the Body Mass Index (BMI) and sleep study parameters in overweight and obese patients suffering from breathing disturbances during sleep. We studied a group of 106 consecutive obese or overweight patients with a primary complaint of snoring or other breathing disturbances during sleep. In all cases, BMI and sleep studies (PolyMESAM) were examined. We evaluated relationship between the BMI and sleep study parameters such as Respiratory Disturbance Index (RDI), Apnea Index (AI), Desaturation Index (DI) and Average of Lowest Saturation (LSAT). The results showed the lack of significant statistical correlations between BMI and all the sleep parameters studied in the overweight patients and the statistical positive correlation between the BMI and RDI in the obese cases. We conclude that BMI determination may be considered as a simple, yet important predictor, of the OSAS in the group of obese patients.

Adult↗
PubMedDate not supplied

Frequency of increased aminotransferases levels and associated metabolic abnormalities in obese and overweight children of an elementary school in Mexico City.

BACKGROUND: Elevated ALT is an indirect marker of NAFLD in patients with non-alcohol abuse and without other known causes of chronic hepatitis. Obesity, type 2 diabetes and some dyslipidemias are associated to this condition. The purpose of this study was to determine the frequency of increased aminotransferases and associated metabolic anomalies among overweight and obese children. METHODS: Children from an elementary school with obesity or overweight were included. Medical history and anthropometrics measurements were recorded and serum liver function tests, lipid profile, glucose and insulin levels, and HOMA index were determined. NAFLD diagnosis was considered in those children with ALT>40 U/L and AST/ALT ratio<1 after exclusion of other causes of chronic hepatitis. RESULTS: Increase ALT levels (>40 U/L) were found in 34/ 80 (42%) obese and overweight children; mean age was 9.5+/-1.1 years and mean BMI of 25.8+/-3. The metabolic abnormalities in the study group were similar, there were no differences in insulin concentration, insulin resistance determined by HOMA-IR Index, serum lipid profile and serum glucose between children with or without increased ALT. CONCLUSIONS: The frequency (42%) of elevated ALT levels in children with excess body weight in this study was greater to those reported in other pediatric populations. There were no differences among the metabolic alterations with or without increased ALT; these findings support that the principal pathogenic factor involved in the development of the hepatic injury may be located in the liver.

Alanine Transaminase↗
PubMed2006

[The use weight loss menues for overweight Icelanders aged 20-40 years].

OBJECTIVE: To carry out an intervention study on weight loss menues for young overweight Icelanders giving 30% less energy than calculated energy need for unchanged body weight, with the percentage of energy giving nutrients in congruity with official recommendations. MATERIAL AND METHODS: Subjects were women (n=71) and men (n=43) aged 20-40 y, having a body mass index (BMI) in the range 28-32 kg/m2. The daily energy for weight balance at baseline was estimated for each individual and a menu prepared to give 30% less energy. Energy distribution was 50% from carbohydrates, 20% from proteins and 30% from fat. Nutritionists gave advice and taught the participants how to use the menus. Weight and height were measured at baseline and at the end of the eight weeks intervention. RESULTS: According to a 30% energy reduction from the daily energy need the menus were prepared to give on average (-/+SD) 1693-/+108 kcal and 1349-/+53 kcal for men and women, respectively. The average weight loss was five kg during the eight weeks intervention, 625 g per week (<0.001). Men lost more weight (around 740 g/week) than women (525 g/week, P=0.003). The proportion of obese (BMI> or =30 kg/m2) decreased from being 47% to 15% during the intervention. CONCLUSION: Menus with the proportion of energy giving nutrients in line with official recommendations, together with nutritional counseling, prove to be a successful mean to bring off weight loss among young overweight Icelandic individuals. The method can be useful in clinical settings in the battle against increasing prevalence of overweight and obesity. It is likely that thorough follow-up treatment is necessary to maintain the weight loss.

Adult↗
PubMedDate not supplied

[Efficient prevention of overweight and obesity in the experience of family practitioners and "nutrition units" of the public health system in Lombardy].

General practitioners (GP's) presence is homogeneously distributed in the Lombardy territory. GP's are easy accessible by people so they could play a key role in the prevention of overweight and obesity. In this study GP's included in everyday medical activity a primary prevention strategy regarding nutrition and lifestyle. The goal was to maintain a constant BMI for one and a half year for at least 50% of the patients (stable means without progression within BMI's range). During the same time another endpoint was to decrease from 1 to 3 units the BMI in overweight patients in half of the observed population. Subjects were randomly recruited during routinely ambulatory activity, without a specific BMI based selection. Diet quality was assessed with a food frequency questionnaire regarding "protective foods" as vegetables, fruits and legumes. Some "basic" information about nutrition and lifestyle where then provided through explanation of issues printed on A4 page brochure. Percentage BMI's range variation before and after the intervention show a stability in the observed population, with an increase 0,3% for normal weight males and 0,9% for females. BMI was constant in 72,2% of the subjects considering a 1 unit variation and in 92,2% considering 3 units variation. Within subjects who varied 1 unit (27,7%) more subjects decreased rather than gained weight (16% vs 11,7%); within subjects who varied 3 units (7.8%), 4,5% decreased and 3,3 increased their BMI. GP's demonstrate to have an efficient role in weight gain control with a simple and regular prevention strategy towards healthy lifestyles and simple nutritional tips. It is important for patients to comprehend the importance the doctor give to the overweight and obesity problem, apart from the medical issue considered during the visit. GP's have a key role for healthy life-style change programs among their patients. These results provide new arguments about the opportunity to invest public resources towards population (managed in collaboration with GP's coordinated by a public health department such as NU), rather than towards a single patient. The project management was supervised by the Nutrition Unit (NU) of the public heath system SIAN (ASL di Brescia).

Body Mass Index↗
PubMed2006

Multiple exposures to smoking, alcohol, physical inactivity and overweight: Prevalences according to the Canadian Community Health Survey Cycle 1.1.

The objective of this study was to calculate the prevalence of multiple exposures to four modifiable risk factors (smoking, alcohol, physical inactivity and overweight) and to establish whether there are more Canadians with multiple risk factor exposures than those with singular ones. Weighted estimates of the prevalence of mutually exclusive risk factor clusters were calculated according to the Canadian Community Health Survey, Cycle 1.1 (2000). Confidence limits were estimated by bootstrap techniques. Findings indicate that 21.0 percent of Canadians have no risk factor exposures, 53.5 percent are physically inactive, 21.5 percent currently smoke, 44.8 percent are overweight, and 6.0 percent are high-risk drinkers. Compared to females, males are less physically inactive but more likely to smoke, have high alcohol intake and be overweight, across all age groups. At least one risk factor was present in 79.0 percent of Canadians and 39.0 percent have at least two coexistent exposures. The distribution of risk factor prevalences differed significantly by age, most peaking among those between age 35 and 64, with the exception of physical inactivity. Those who smoke and are physically inactive account for the highest proportion of the population with two or more coexistent risk factors. Canadians who are free of the four risk factors for chronic disease examined in this paper constitute the minority. Future studies are recommended to examine other risk factors, as well as interactions of multiple exposures in association with chronic disease.

Adolescent↗
PubMed2006

Report on childhood obesity in China (2). Verification of BMI classification reference for overweight and obesity in Chinese children and adolescents.

OBJECTIVE: To verify Working Group for Obesity in China (WGOC) recommended body mass index (BMI) classification reference for overweight and obesity in Chinese children and adolescents using the data of 2002 China Nationwide Nutrition and Health Survey. METHODS: Pediatric metabolic syndrome (MetS) and abnormality of each risk factor for MetS were defined using the criteria for US adolescents. Definition of hyper-TC, LDL, and dyslipidemia in adults was applied as well. The average level and abnormality rate of the metabolic indicators were described by BMI percentiles and compared with general linear model analysis. Receiver operating characteristic analysis was used to summarize the potential of BMI to discriminate between the presence and absence of the abnormality of these indicators. RESULTS: There was neither significantly increasing nor significantly decreasing trend of biochemical parameter levels in low BMI percentile range (<65th). Slight increasing trend from the 75th and a significant increase were found when BMI > or =85th percentile. In general, the prevalence of the examined risk factors varied slightly when BMI percentile<75th, and substantial increases were consistently seen when BMI percentile > or =75th. As an indicator of hyper-TG, hypertension and MetS, the sensitivity and specificity were equal at the point of BMI<75th percentile, and the Youden's index of risk factors also reached peak point before 75th percentile except for MetS. When the BMI percentile was used as the screening indicator of MetS, Youden's index reached peak point at 85th percentile, just the point in the ROC graph that was nearest to the upper left corner. CONCLUSION: The BMI classification reference for overweight and obesity recommended by WGOC is rational to predict and prevent health risks in Chinese children and adolescents. Lower screening cut-off points, such as 83th percentile or 80th percentile, should not be excluded when they are considered as overweight criteria in future intervention or prevention studies.

Adolescent↗
PubMed2006

Fufang cangzhu tang for treatment of senile obesity or overweight complicated with impaired glucose tolerance --a clinical observation in 32 cases.

OBJECTIVE: To observe the therapeutic effect of Fufang Cangzhu Tang (Composite Atractylodes Decoction) on senile obesity or overweight with impaired glucose tolerance (IGT). METHODS: 32 cases of senile obesity or overweight with IGT were treated with Composite Atractylodes Decoction, with another 30 cases treated with dimethyldiguanide as the controls. Changes of body weight, waist circumference, hip circumference, waist hip circumference ratio (WHR), glucose tolerance, fast serum insulin and blood lipid before and after treatment were compared. RESULTS: After treatment, the body weight, waist circumference, hip circumference and WHR, glucose tolerance, fast serum insulin and blood lipid in the Composite Atractylodes Decoction treatment group decreased significantly (P < 0.05 or P < 0.01), with no significant difference as compared with the control group (P > 0.05). CONCLUSION: Composite Atractylodes Decoction can obviously decrease the body weight, waist circumference, hip circumference, WHR, glucose tolerance, fast serum insulin and blood lipid in the senile patients with obesity or overweight with impaired glucose tolerance.

Aged↗
PubMed2000

Dieting and the development of eating disorders in overweight and obese adults.

We reviewed articles evaluating the relations among dieting, weight loss treatment, weight cycling, eating disorders, and psychological functioning in overweight and obese adults. Moderate caloric (energy) restriction, in combination with behavioral weight loss treatment, does not seem to cause clinically significant binge eating in overweight adults without preexisting binge eating problems and might ameliorate binge eating, at least in the short term, in those reporting recurrent binge eating before treatment. Most studies of behavioral weight loss interventions report improvements in psychological status during weight loss. However, these improvements might return to baseline with weight regain. Weight cycling does not seem to be associated with clinically significant psychopathologic conditions, although results of cross-sectional studies show an association between weight cycling and binge eating, as well as poorer perceived health status. "Nondieting" approaches seem to lead to improvements in mood and self-esteem; however, weight loss is generally minimal. Concerns that dieting induces eating disorders or other psychological dysfunction in overweight and obese adults are generally not supported by empirical studies. Such concerns should not preclude attempts to reduce caloric intake and increase physical activity to achieve modest weight loss or prevent additional weight gain.

Adult↗