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Query: UMLS:C0028754 (obesity)
 124,988 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Obesity was studied in a colony of 873 Macaca nemestrina to establish tools for epidemiologic studies, to examine a genetic form of obesity, to document age/sex relationships to obesity, and to compare metabolic profiles of obese and normal monkeys. Age/weight growth curves were analyzed to select the most obese monkeys and age- and sex-matched normal controls. Degree of adiposity was determined using tritiated water for estimation of lean body mass. Body weight, anterior trunk height, and abdominal and triceps skinfolds were measured. Fasting insulin, fasting free fatty acids, and glucose disappearance rate were determined. The results give evidence of similarities between macaque and human obestiy.
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PMID:Assessment of obesity in pigtailed monkeys (Macaca nemestrina). 41 Sep 39

In severe obesity with adipose tissue hyperplasia it is difficult to achieve and sustain weight decrease by conventional therapy. Fifteen severely obese patients (mean body weight 135 kg) with hyperplastic obesity had a jejuno-ileostomy according to Payne to induce weight reduction by controlled malabsorption. Body composition, adipose tissue cellularity, and glucose tolerance were studied before and after the operation when the patients had reached a new stable weight (WS) a mean 21 months after surgery. Preoperative fat cell number was unchanged at follow-up in contrast to all other variables of body composition. Reductions in fat cell size were evenly distributed in different major subcutaneous regions. Body potassium was determined immediately after operation and at 6 months intervals until WS. The postoperative decrease stopped at 6 months, thus differing from the decrease in body weight. Significant positive correlations between the postoperative decrease in body weight or body fat, and preoperative body weight, body fat and body cell mass were analysed by multiple stepwise regression. Preoperative body weight and body fat were shown to predict postoperative weight loss at a leve of P less than 0.005. A positive correlation between body fat decrease and fat cell number could be explained hypothetically by an increased caloric demand in hyperplastic obesity.
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PMID:Body composition and adipose tissue cellularity before and after jejuno-ileostomy in severely obese subjects. 41 71

Sixteen insulin dependent diabetic patients (age at onset less than 35 years) and their families were tissue typed for HLA antigens. Glucose tolerance of relatives was also tested. Among diabetic patients two HLA antigens were found with increased frequency: B8 (31 percent, control 15 percent) and Bw35 (38 percent, control 23 percent). Among normal relatives B8 and Bw35 had the same frequency as the control group. Bw15 frequency was not increased in either group. In relatives, no correlation between HLA antigens (B8 or Bw35) and abnormal glucose tolerance, obesity and over-weight at birth was found. Present data confirm previous reports of high B8 frequency in early onset diabetic patients, but fail to demonstrate a raised frequency of abnormal glucose tolerance among relatives bearing B8 (or, in our cases, Bw35). B8 may be considered a genetic indicator for susceptibility to juvenile diabetes. On the basis of present results in families, however non genetic factors clearly also play a determinant role. Furthermore, that diabetogenesis arises from a link between Ir-genes and HLA-B8 antigen should only be considered a suggestive hypothesis.
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PMID:HLA antigens and insulin dependent diabetes mellitus. A family study. 41 51

Complex clinical and laboratory research of nonspecific immunobiological reactivity was conducted in 86 children (35 with diabetes mellitus, 25 with obesity, and 26 healthy children), aged from 3 to 14 years. Lysozyme activity and complement titre were studied during the disease. Reduced reactive possibilities of the organism were demonstrated in diabetic children; reduction of these parameters was directly proportional to the severity of the main process and the extent of decompensation. In obese patients the parameters of nonspecific reactivity tests were higher than in healthy children, and glucose tolerance was disturbed; this was apparently connected with stress of the compensatory-defense mechanisms of the organism. A distinct reduction of the parameters in this group of children under the effect of unfavourable factors pointed to exhaustion of the compensatory mechanisms. Obese patients should be referred to the group of children will increased risk, both in respect to diabetes mellitus and to other diseases. The indices under study could be applied as tests characterizing not only the immunobiological reactivity and the defense-adaptive mechanisms of the organism, but also the severity and phase of the disease.
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PMID:[Comparison of the clinical and immunological indices in children with diabetes mellitus and obesity]. 42 86

Peripheral serum insulin and C-peptide concentrations during oral glucose tolerance tests were measured in 10 nondiabetic Pima Indians and 10 nondiabetic Caucasians with varying degrees of obesity. Although both insulin and C-peptide levels were elevated in the Indians compared to the Caucasians (p less than 0.05), hepatic insulin extraction, measured by comparing the C-peptide to insulin ratios, was similar over a wide range of insulin concentrations in both groups. The ratios of C-peptide to insulin were independent of the degree of obesity. These studies indicate that the peripheral hyperinsulinemia in Pima Indians and obese subjects is due in general to pancreatic hypersecretion rather than to diminished hepatic extraction of insulin.
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PMID:C-Peptide and insulin secretion in Pima Indians and Caucasians: constant fractional hepatic extraction over a wide range of insulin concentrations and in obesity. 42 4

1496 women age 55 to 74 were studied in an effort to determine heart disease risk factor differences attributed to postmenopausal estrogen (PME) use. 39% of the females reported using estrogen at the time of the study, with peak hormone use in the 55 to 59 year age group. Analysis of the following possible confounding variables, social class, current cigarette smoking, family history of heart attack or diabetes and obesity found that only obesity was statistically significant ( P .001) and thus further analysis of PME use was adjusted for obesity. Results showed average cholesterol level was 9.4 to 20.4 mg/dL lower among PME users compared to nonusers. Although triglyceride level was higher in PME users at all ages it was only statistically significant for women aged 60-69 years. Mean systolic and diastolic blood pressures were 2 to 4 mm Hg lower in PME users and the average fasting plasma glucose level was significantly lower in young PME users only. Multivariate Hotellings T statistic was used to test for independence. While the study examined the net cumulative effect of PME use of putative heart disease, it did not examine specific estrogens, dosage or duration of use differences. The authors concluded that further studies are needed before final conclusions can be made regarding the use of PME as a risk factor reducer in heart disease.
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PMID:Heart disease risk factors and hormone use in postmenopausal women. 43 Aug 17

Blood glucose levels were studied prospectively in 40 patients undergoing elective major craniotomy. A significant (p less than 0.01) hyperglycaemic response was noted after scalp infiltration with adrenaline and incision (0.5 mmol/l) and with continued surgery (0.9 mmol/l). Patients aged 50 years and under showed a significantly greater rise with adrenaline and incision than older patients (0.8 compared with 0.4 mmol/l p less than 0.01). Preoperative high dose steroid therapy did not modify the response. Blood glucose changes were unrelated to sex, obesity, a family history of diabetes, the duration of starvation, intraoperative body temperature, anaesthetic technique, induced hypotension or blood loss.
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PMID:Blood glucose changes during neurosurgery. 43 41

To study the role of nutritional factors in the genesis of diabetes, estimations of blood sugar concentration, food intake, and adiposity (as body mass index; BMI) were carried out on three normal population samples--namely, 961 employees of Beecham Ltd, 1005 employees of the Greater London Council, and 1488 middle-aged male civil servants (Whitehall study). Blood sugar concentrations and indices of glucose tolerance correlated positively with the degree of adiposity but tended to be negatively correlated with total food energy intake and its component nutrients (total carbohydrate, sucrose, and fat). This inverse trend was largely accounted for by highly significant inverse correlations between food energy intake and adiposity, a relation found in both sexes and in all three population samples and which extended across the whole range of nutrient intake and BMI. These findings suggest that greater degrees of adiposity are associated with lower than average food energy intakes and hence lower total energy expenditures. The association of increased adiposity with low food energy consumption may indicate an underlying "low energy throughput" state, and it may be the mechanisms of this, as well as the obesity, that are responsible for disease.
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PMID:Nutrient intake, adiposity, and diabetes. 43 10

The acute effect of bilateral electrolytic ventromedial hypothalamic lesions (20-25-m Coulomb stainless steel electrodes) on plasma levels of insulin and glucose was studied in anesthetized rats to determine early effects that would occur before hyperphagia and obesity. In rats fed ad libitum, lesions in the ventromedial hypothalamus (VMH) but not in the cortex produced a marked increase in circulating insulin levels (starting at 20 min postlesion) and a small increase in glycemia which, however, was not significant and could therefore not be the cause of increased insulin secretion. Hyperinsulinemia after VMH lesions was more pronounced when glucose was infused iv at a rate of 7-8 mg/kg . min. Bilateral subdiaphragmatic vagotomy, performed 50 min after VMH lesions, immediately and completely reversed the observed hyperinsulinemia. With the exception of a tendency of lesions producing the highest degree of hyperinsulinemia to be slightly larger than the lesions not producing any hyperinsulinemia, no statement about the critical involvement of a specific hypothalamic locus can be made. It is concluded that electrolytic VMH destruction causes immediate hypersecretion of the pancreatic B cell, an effect that requires the integrity of the vagus nerves. Further localization of the central circuitry responsible for this mechanism, however, will require more specific methods than electrolytic lesions.
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PMID:Acute hyperinsulinemia and its reversal by vagotomy after lesions of the ventromedial hypothalamus in anesthetized rats. 44 4

The characteristics of the glucose and insulin responses during the glucose tolerance test (GTT) in obese people as a group have not been established. We analyzed glucose and insulin levels during GTT in 160 healthy obese patients who averaged 42% over ideal body weight. Statistical upper limit of normal for 2-h glucose was 260 mg/dl in women and 206 mg/dl in men. Although there was a significant correlation between insulin and glucose levels in both sexes and between insulin and degree of obesity in women, r values were relatively low (r less than 0.4 for all). High insulin levels and delayed peak insulin were present in the majority of patients with normal GTT and absent in many of the most obese patients. Results indicate that upper limits of normal glucose for GTT in the obese are much higher than currently accepted criteria.
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PMID:Glucose-insulin response to oral glucose in a healthy obese population. 44 5


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