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PubMed1999

The lateral hypothalamic syndrome in the weanling rat: bone geometry and biomechanics.

Male weanling Sprague-Dawley rats received bilateral electrolytic lesions in the lateral hypothalamic area (LHAL). One group of sham-operated controls was fed ad lib (CON-ADLIB), another was pair fed to the LHAL group (CON-PF). The experiment was terminated 1 month after surgery. At that time, LHAL rats were 49% and CON-PF rats were 41% lighter than CON-ADLIB. Carcass protein in LHAL rats was significantly reduced in LHAL: versus CON-ADLIB. Linear growth was significantly reduced by 18% in LHAL versus CON-ADLIB, as well as LHAL: versus CON-PF by 6%. Mean caloric intake was significantly reduced by 48% in LHAL versus CON-ADLIB, as was caloric efficiency (body weight gained per calories eaten) by 36%, as well as, in CON-PF versus CON-ADLIB by 20%. LHAL rats showed a significantly shorter (10%), narrower (15%) and thinner (25 %) cortex at midshaft of the femur. Resistance to torsional loads was reduced by 25% in both LHAL and CON-PF, but this did not reach statistical significance, in comparison to CON-ADLIB. There was no statistical significance among the groups in stiffness and maximal angular displacement. We conclude that the reduced bone geometrical and biomechanical properties in both LHAL rats and CON-PF versus CON-ADLIB are similar because both former groups of rats were greatly subcaloric. Thus, the changes here observed are not due to a specific neuroendocrine/autonomic lesion effect but may be attributable to the reduced food intake, i.e., nutritional factors.

Animals↗
PubMed1986

Caloric regulation in the rat: control by two factors.

These experiments demonstrate that rats can immediately adjust their meal size in response to variations in the caloric density of a novel diet. However, this immediate caloric sensitivity only seems to appear when rats have been adapted to small, calorically insufficient meals. Rats in Experiment 1 were given timed access to unlimited quantities of an oil/water diet during baseline, and they showed no indication of compensating for changes in the caloric density of the oil/water diet during a test meal. Instead, they consumed about the same amount they had consumed during the preceding baseline meal, suggesting that a learned habit of consuming a certain volume of food controlled their meal size. In contrast, rats that were accustomed to receiving only a very small quantity of food for one of their daily meals during baseline immediately responded to the caloric density of an oil/water test diet by consuming a larger meal if the diet was dilute than if it was calorically more concentrated (Experiments 2 and 3). This immediate sensitivity to caloric density occurred whether or not the rats were exposed to the oil/water diet during baseline, suggesting that rats have some way of directly "metering" the caloric density of new foods. Thus, rats' caloric intake during a meal appears to be controlled by two factors: under certain conditions, control is by caloric learning, under other conditions control is by a caloric metering mechanism.

Adaptation, Psychological↗
PubMed1988

Comparison of the effects of aspartame and sucrose on appetite and food intake.

We have studied the effects of consumption of foods sweetened with either sucrose or aspartame on appetite ratings and food intake. Normal weight, non-dieting subjects ate the same amount of high- and low-calorie versions of pudding or jello and despite the resulting difference in caloric intake, showed only a non-significant trend towards compensation in a lunch one or two hours later. There were no significant differences between rated hunger, fullness, desire to eat, the amount subjects wanted to eat, or sensory-specific satiety following the high- and low-calorie foods. Knowing the caloric values of the foods did not influence intake or appetite ratings in that both informed and uninformed subjects responded similarly. Thus in the short term subjects tended to eat a constant amount of a particular food and this volume had a greater effect on appetite ratings and subsequent intake than the calories consumed.

Appetite↗
PubMed1993

Nutritional assessment of drug addicts. Relation with HIV infection in early stages.

OBJECTIVE: To assess the nutritional status of drug addicts without acute organic pathology, in order to determine the prevalence of malnutrition and to discern if early HIV infection is associated with a poor nutritional status in this group of patients. DESIGN: Prospective study. SETTING: Detoxication unit of a university hospital. PATIENTS: 140 drug addicts without acute organic pathology. 31 patients were HIV+. No one fulfilled the definition of AIDS. RESULTS: We found that drug addicts were undernourished: 92.4% weighed under the mean populational weight and 55.7% had a weight loss above 5%. The distribution of mid upper arm circumference (MUAC), triceps skinfold (TSF) and mid arm muscle area (MAMA) was lower than a reference normal population. Food intakes were poor; 66.4% of our patients complained of anorexia on admission. The mean caloric intake was 978 +/- 89 kcal/day in females and 1265 +/- 64 kcal/day in males. The mean protein intakes were 39.3 +/- 3.3 g/day in females (0.76 +/- 0.07 g/kg/day) and 49.7 +/- 2.7 g/day in males (0.77 +/- 0.04 g/kg/day). When we compared nutritional parameters between HIV+ and HIV- patients we found no differences. CONCLUSIONS: Nutritional impairment in drugs abusers with early stages of HIV infection should be attributed to drug abuse rather than to HIV infection.

Journal Article↗
PubMed1978

Relationships between spontaneous food intake and metabolic activities in the dormouse (Glis glis L.).

1. The relationships between food intake self-selection and liver substrates (glycogen, fat) or activities of pyruvate kinase, glucose-6-phosphate dehydrogenase, malic enzyme, acetyl CoA carboxylase, glucose-6-phosphatase and phosphoenolpyruvate carboxykinase were determined during the spontaneous variations of body weight in the dormouse. 2. The results show that during the phase of increasing body weight, carbohydrate intake and enzyme activities involved in lipogenesis are on a high level. 3. On the last part of the body weight increasing phase, when lipid intake occurs, lipogenesis is depressed and a gluconeogenetic activity is set on, while total caloric intake is important and body weight is still increasing. 4. These metabolic changes are interpreted as a preparation to hibernating conditions in the dormouse.

Animals↗
PubMedDate not supplied

Effect of cholecystokinin octapeptide on ethanol intake in the rat.

Water-deprived rats received 3%, 6% or 9% ethanol solution or water for 30 min daily. Intraperitoneal injection of cholecystokinin octapeptide (CCK-8, 2.0-4.0 micrograms/kg) significantly and specifically inhibited ethanol intake. The findings are consistent with previous reports of specificity of the inhibition of caloric intake by CCK-8. Administration of CCK-8 may influence ethanol intake by modulating a satiety signal that ordinarily controls ethanol intake.

Alcohol Drinking↗
PubMedDate not supplied

Female Syrian golden hamster: drinking of high concentrations of ethanol aversive to other mammals.

The present experiments were designed to determine: 1) the pattern of preference for different concentrations of ethanol in the female Syrian golden hamster (Mesocricetus auratus), and 2) the influence of drinking ethanol on their intakes of food and total calories. A standard three-bottle preference test was undertaken in six female hamsters over an 11-day period in which water was offered together with ethanol, which was increased in concentration over 11 days from 3% to 50% as follows: 3%, 5%, 7%, 9%, 12%, 15%, 20%, 25%, 30%, 40%, 50%. Then, each hamster was offered its individually preferred concentration for a period of 8 days until the intake of ethanol had stabilized. During the preference testing for 3-25% solutions, the proportional intakes ranged between 0.6 and 0.8 whereas the mean absolute amount consumed per day increased from 2.3 to 16.1 g/kg at the 25% concentration. However, at the 50% concentration, ethanol drinking declined substantially to 8.7 g/kg per day. The overall mean percent concentration of ethanol preferred by the hamsters was 24.2 +/- 1.5%. During the following 8-day period when the maximally preferred concentration of ethanol of each hamster was offered with water, the mean intake of ethanol was 17.9 +/- 1.1 g/kg per day. Throughout the test sequence, the caloric intake of the animals was maintained in that calories obtained from food declined at the same rate as the calories obtained from ethanol in rising concentrations.(ABSTRACT TRUNCATED AT 250 WORDS)

Alcohol Drinking↗
PubMed2005

Sodium intake among people with normal and high blood pressure.

BACKGROUND: The American Heart Association recommends no more than 2400 mg of sodium intake per day for healthy adults. Healthy People 2010 goals are to increase the proportion of persons who consume 2400 mg or less of sodium daily. We examined daily sodium intake among people with and without high blood pressure. METHODS: We used data for participants aged > or = 20 years from the 1999-2000 National Health and Nutrition Examination Survey. Of 4011 participants included in this analysis, 1673 were identified as hypertensive by self report, with systolic blood pressure > or = 140 mm Hg or diastolic blood pressure > or = 90 mm Hg. Dietary sodium intake was computed from foods and beverages consumed during the 24 hours prior to interview. RESULTS: Mean sodium intake among participants with and without high blood pressure was 3330 mg/day and 3600 mg/day (geometric means, 2885 mg/day and 3146 mg/day), respectively. The difference between the two groups, using log-transformed sodium intake, was statistically significant (p<0.001). Adjustment for age, gender, race/ethnicity, education, smoking, total caloric intake, physical activity, and body mass index resulted in a smaller but significant difference (2992 mg/day and 3089 mg/day, p<0.05). No difference in sodium intake was observed by prescription medication use or advice to reduce sodium among hypertensive participants. CONCLUSIONS: Although participants with hypertension reported lower intake of dietary sodium than those with normal blood pressure, daily intake of sodium was much higher than the recommendations in both groups. Increased efforts are needed to reduce sodium intake to achieve Healthy People 2010 goals.

Adult↗
PubMed2005

Association between dietary arginine and C-reactive protein.

OBJECTIVE: We investigated whether a dietary intake of arginine is associated with risk for cardiovascular disease as determined by levels of C-reactive protein (CRP). METHODS: We analyzed the Third National Health Nutrition and Examination Survey, a national public-use dataset collected between 1988 and 1994. Arginine intake was calculated from the 24-h dietary recall using the nutrient composition database of the University of Minnesota Nutrition Coordinating Center. A logistic regression model was used to evaluate the relation between arginine intake and serum levels of CRP while controlling for age, sex, race, exercise, total caloric intake, body mass index, smoking status, diabetes, hypertension, and fiber intake. RESULTS: In the unadjusted model, the likelihoods of having a high level of CRP (>3.0 mg/L), from the lowest to the highest level of arginine intake, were 34.8%, 31.0%, 27.7%, and 18.4% respectively. Arginine intake below the median range was associated with higher levels of CRP (P < 0.05), and arginine intake above the median range was associated with lower levels of CRP (P < 0.05). In the adjusted regression, subjects in the highest level (90th percentile) of arginine intake were 30% less likely to have a CRP above 3.0 mg/L than were subjects with a median arginine intake (odds ratio= 0.70, 95% confidence interval = 0.56 to 0.88). CONCLUSIONS: The results of this study show a relation between arginine intake and CRP level that persisted after controlling for factors associated with CRP. Individuals may be able to lower their risk for cardiovascular disease by consuming more arginine-rich foods such as nuts and fish.

Adult↗
PubMed2003

[Dietary variety and diversity of Spanish children: Four Provinces Study].

BACKGROUND AND OBJECTIVE: Diet variety is claimed for ensuring a healthy eating. Our objective was to analyze the relationship between the variety and diversity of the diet and its nutritional quality among Spanish children. SUBJECTS AND METHOD: Cross-sectional study where information on food and nutrition was obtained through a food frequency questionnaire. The sample included 1,112 children aged 6-7 years from 4 cities. Children were selected by random cluster-sampling in schools and stratified by sex and socioeconomic level. We calculated a diet variety index (DVI)--count of food items--and a diet diversity index (DDI)--count of food groups. To measure the overall diet quality, the Healthy Eating Index (HEI-f) was used. RESULTS: The percentage of children eating less than one daily food serving varied between 0% for the grain and 11.3% for the fruit groups. Diet variety and diversity were positively associated with the intake of fiber, vitamines B6 and E and folic acid, and the percentage of caloric intake resulting from polyinsaturated fatty acids and carbohydrates. In contrast, intakes of lipis and saturated fatty acids, vitamine C, sodium and calcium were all negatively associated with diet variety and diversity. Although both DVI and DDI were possitively associated with the HEI-f, the results from a regression model showed that it was only DDI that contributed significantly to the model fitting (p < 0.001). CONCLUSIONS: These results support the goodness of a varied diet that includes ingredients from different food groups and, at the same time, maintains the energy energy within recomended levels.

Child↗
PubMed1999

Effect of dietary macronutrients on food intake, body weight, and tail width in the marsupial S. crassicaudata.

The role of dietary fat, as opposed to total energy intake, in the etiology of obesity is controversial. The aim of this study was to determine the effect of macronutrient content, specifically changes in dietary fat on body weight, fat stores, and food intake in S. crassicaudata, a marsupial that stores about 25% of total body fat in its tail. Female animals were divided into three groups (n = 7-9) matched for food intake per gram of body weight. Each group of animals was fed, ad lib an isocaloric diet (1.01 kcal/g), which contained either 10, 20, or 40% of calories from fat. Body weight, food intake, and tail width (an index of body fat stores) were measured daily. Over 21 days, cumulative energy intake was less (p = 0.026) in the 40% fat group compared to the 10% fat group. Despite the differences in food intake, body weight in each group remained stable throughout the study, so that at day 21 there were no differences in the body weights between the three groups. In contrast, tail width increased in the animals who received the 40% fat diet compared to either the 10% (p = 0.016) or 20% (p = 0.001) fat intake groups, whereas there was no significant change in tail width in either of these two groups. These observations indicate that macronutrient composition has a role, independent of total calories in the regulation of food intake and body fat stores, specifically that dietary fat promotes adiposity, independent of total caloric intake.

Animals↗
PubMed1981

Dietary regulation of insulin receptors in obesity.

Hospitalization of obese patients on a 45% carbohydrate diet resulted in a decrease of insulin binding to circulating monocytes. A further decrease was observed when the carbohydrate content was increased to 75% of total calories. When carbohydrate intake was restricted to 10% of total calories, insulin binding returned to normal. Total caloric intake was kept constant so that changes in insulin binding were not due to changes in body weight. Serum insulin levels were elevated in all obese patients regardless of what diet they were on receiving. The serum glucose level rose slightly in the patients on carbohydrate restriction despite the rise in insulin binding and persistance of hyperinsulinemia. I concluded: 1) factors other than a defect in insulin receptors contribute to insulin resistance in obesity; 2) although high insulin concentrations decrease insulin receptors in cells grown in vitro, cells from patients with hyperinsulinemia do not necessarily show decreased insulin binding; and 3) insulin binding is affected by the carbohydrate content of the diet and probably by other factors as well.

Adult↗
PubMedDate not supplied

Caloric requirements of patients with burns under one year of age.

Formulas for estimating the caloric requirements of pediatric patients with burns have been suggested. However, the needs of infant patients with burns have not been specifically addressed. This study was undertaken to determine the caloric intake required to maintain weight in patients under 1 year of age who had burns covering more than 25% total body surface area. Thirty patients were studied, and a comparison was made between the actual intake required for weight maintenance and the suggested calorie levels provided by published pediatric caloric formulas. The results indicated that a new formula was needed. Multivariate regression analysis indicated that body surface area and burn surface area were significant predictors of caloric requirements, but body surface area was the more important predictor in this infant population. The equation resulting from the regression provides 2100 kcal/m2 body surface area/day plus 1000 kcal/m2 body surface area burned/day.

Age Factors↗
PubMed1995

Dietary intake of female collegiate heavyweight rowers.

The purpose of this study was to evaluate the adequacy of dietary intake in 16 female heavyweight rowers during the sprint racing phase of the season. Caloric intake for the rowers was 2,633 kcal/day, lower than expected given the training regimen of these athletes. On average, rowers consumed below-optimal levels of carbohydrate. Protein intake was satisfactory but fat intake was higher than recommended. For the majority of rowers, micronutrient intake met the RDA. However, calcium, zinc, B6, and B12 fell short of meeting two-thirds of the RDA for a significant percentage of rowers. The preevent meal consumed both 15 hr and 2 hr before the event provided less carbohydrate and fluid but more fat than desirable. Female heavyweight rowers would benefit from nutritional counseling that provides strategies for increasing complex carbohydrates, calcium, zinc, B6, and B12 while reducing dietary fat. Adequate fluid intake is also essential.

Adult↗
PubMed1972

Lipogenesis in human adipose tissue: some effects of nibbling and gorging.

Six grossly obese patients were fed 5000 calorie diets for 4 wk. During one period of 2 wk, the calories were consumed over 4 hr (gorging) and during the other 2 wk, the dietary intake was spread over 20 hr (nibbling). Each of these periods followed a low caloric intake which lasted at least 10 days. Three male patients (group I) were studied at or near their maximal weight and three females (group II) after a weight loss of 50-70 kg. The patients in group II gained more weight than those in group I. Lipogenesis from pyruvate was greater in group II than in group I. Rapid ingestion of food (gorging) was accompanied by a significant increase in glyceride-glycerol-(14)C and fatty acids-(14)C from pyruvate-(14)C. The enzymatic activity of sn-glycerol 3-phosphate dehydrogenase and mitochondrial glycerophosphate oxidase paralleled the rate of formation of glyceride-glycerol. Lipogenesis from pyruvate was significantly lower when the bicarbonate concentration was reduced from 25 to 10 mM. Citrate and acetate were also converted to fatty acids but there was no difference between gorging and nibbling. An inhibitor of carbonic anhydrase significantly reduced the conversion of pyruvate into CO(2), glyceride-glycerol, and fatty acids. These data on gorging and nibbling have been related to other studies suggesting that the frequency of food intake may be inversely related to obesity.

Acetates↗
PubMed2005

Nutritional, functional, and emotional characteristics related to fatigue in patients during and after biochemotherapy.

PURPOSE/OBJECTIVES: To test Winningham's psychobiologic entropy hypothesis in patients receiving biochemotherapy for melanoma. DESIGN: Descriptive, correlational, cross-sectional study. SETTING: Midwest cancer center. SAMPLE: 25 male and female patients who were receiving biochemotherapy or who had completed treatment 6-12 months prior. METHODS: Data were collected using a series of questionnaires and diet recall. MAIN RESEARCH VARIABLES: Fatigue, anxiety, depression, distressing symptoms, nutritional intake, and weight. FINDINGS: Moderate fatigue was significantly related to physiologic and psychological symptoms but not to nutrient intake. The sample was overweight, and a significant number of participants were obese. High caloric intakes were evident. Depression was a significant problem. CONCLUSIONS: Fatigue was not as severe as expected, but problems with responses to the fatigue scale may explain this. Nutritional status and nutrient intake were not correlated to fatigue in this sample. Activity levels were related to fatigue, and treatment reduced activity. On average, activity returned to pretreatment levels 6-12 months after treatment. Winningham's hypothesis held and will be useful for understanding fatigue in this population. IMPLICATIONS FOR NURSING: Depression needs to be assessed and treated as a side effect of biotherapy. Assessing the impact of nutrition when patients are overweight or obese is difficult. A scale specifically designed to test Winningham's hypothesis is needed.

Adult↗
PubMedDate not supplied

A pilot study to determine the feasibility of the low glycemic index diet as a treatment for overweight children in primary care practice.

BACKGROUND: The prevalence of overweight children is increasing. Experimental evidence and specialty clinic trials suggest that a low glycemic index (LGI) diet could be an effective primary care-based treatment for overweight children. OBJECTIVE: Conduct a pilot study to determine whether parents of overweight children can lower the glycemic index (GI) of their child's diet after receiving brief instructions and a handout from their pediatrician; and the diet's impact on body mass index (BMI). PATIENTS: Children 5-12 years with BMIs greater than the 95th percentile. INTERVENTION: Brief description of the LGI diet and a handout categorizing foods based on their GI and sample meals. DESIGN: Nonrandomized, 12-week pilot study. MEASURES: BMI, 24-hour recall, and food frequency questionnaire (FFQ) at entry; 3-day food records at 3, 6, and 9 weeks; BMI, FFQ, and questionnaire at 12 weeks. A GI score derived from standard GI tables. RESULTS: Of 34 children initially enrolled, 15 completed the study. Of these, 14 lowered their GI score (mean initial score = 26.6; mean score at 12 weeks 15.6; P <.0001). Mean daily carbohydrate (CHO) intake decreased by 73 g over the study period (P <.02), and mean daily caloric intake decreased by 292 kcal (P <.02). All 15 parents described the diet as easy to understand; 10 reported that their child was generally able to follow the diet. BMI Z-score decreased in 12 of 15 children. CONCLUSION: This pilot study suggests that implementing the LGI diet is feasible in primary care for some patients. Further study is warranted with larger study and comparison groups.

Adult↗
PubMedDate not supplied

Nutrient and food intake in obese women on a low-fat or low-calorie diet.

The low-fat group consumed significantly fewer calories from fat and more calories from carbohydrate at both 6 and 12 months than the low-calorie group, but their fat intake was still about twice their goal at both 6 months (39 gm per day) and 12 months (46 gm per day). The low-calorie group achieved their fat goal of 30% of calorie intake, but they consumed from 300 to 700 kcal more than their calorie goal. Caloric intake, physical activity, palatability, satiety, quality of life, and weight loss were not significantly different by treatment. Two studies, which gave patients hypocaloric diets of varying fat and carbohydrate content (fat calories 10% to 45%) for from 10 to 12 weeks, found no effect of diet composition on weight loss. In addition, one study, which gave patients a low-fat, energy-unrestricted diet (fat calories 19%), reported a weight loss of 10.1 lb at 16 to 20 weeks and 5.7 lb at 9 to 12 months, which is similar to that seen in the low-fat group in the this study. Most of the decrease in fat intake (90%) in the low-fat group resulted from a reduction in intake of fat from fat and oils; meat, fish, and poultry; dairy products; and sweets. The dietary changes in the low-fat group are consistent with those found in one study, which prescribed a 15% fat calorie diet to women with breast cancer. Intake of vitamin C increased in the low-fat group and decreased in the low-calorie group. This difference was significant and was caused by an increased intake of fruits and vegetables in the low-fat group and a decreased consumption of fruits in the low-calorie group. Calcium intake decreased significantly more in the low-calorie group because of a decreased intake of dairy foods.

Adult↗