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PubMed1996

Role of brain cocaethylene levels in combined cocaine-ethanol lethality in mice.

The purpose of this study was to examine the lethal effects of combining cocaine with ethanol in mice by assaying for cocaethylene at the time of death. After the voluntary oral ingestion of ethanol in the form of a liquid diet containing 35% ethanol-derived calories for 5 days, intraperitoneal cocaine (60 mg/kg) was administered daily for up to 5 days while the ethanol diet continued (ethanol diet group). The mice in the ethanol diet group were paired with control mice that received a control liquid diet containing equivalent carbohydrate calories in the form of sucrose instead of ethanol (control diet group). In order to analyze the drugs, samples (blood, liver and brain) were collected for both groups from the dead animals that could not tolerate the 5 days of cocaine administration. A higher rate of lethality was observed in the ethanol diet group as compared to the control diet group. Furthermore, various patterns of cocaine lethality were revealed under different conditions of ethanol intake. According to the survival times after the last cocaine administration, observed respiratory and locomotive disorders, and drug concentrations, a total of 5 subgroups in the ethanol diet group (Groups E1-E5) and a total of 3 subgroups in the control diet group (Groups C1-C3) were differentiated. The ratio of the mean cocaethylene concentration relative to the mean cocaine concentration was over 30% in the livers of animals in an earliest lethal subgroup (Group E1). In addition, examination of all of the dead animals in the ethanol diet group revealed the prolonged presence of cocaethylene in the brain of the mice that died within 2 hours. Thus, it was suggested that cocaethylene has strong effects on the brain receptors and influences cocaine lethality.

Animals↗
PubMed1985

Characterizing consumption patterns by food frequency methods: core foods and variety of foods in diets of older Americans.

This study was designed to explore the applications and limitations of two relatively simple and inexpensive scoring systems currently used to describe food patterns. The approaches examined were variety index and core foods. The sample, stratified by age and sex, consisted of adults more than 54 years old (no. = 4,983) who were interviewed in the 1977-1978 Nationwide Food Consumption Survey. Variety index was determined by counting the number of different foods consumed over 3 days. Core foods were identified by tallies of the most frequently mentioned foods and by calculations of frequency use scores. The variety of foods consumed was smallest for the oldest groups. Core food lists did not vary markedly with age, sex, or analysis by tally or score. The items consumed on at least 1 of the 3 days by approximately 50% of the persons surveyed were: whole milk, ground coffee, instant coffee, white bread, potatoes prepared by methods other than frying, margarine, and sugar. Although the variety index approach provides a general sense of nutrient diversity of a diet, core food lists with weighted scores appear to be more applicable when the relationship between food usage and food-related behaviors is studied and changes in eating patterns are monitored.

Age Factors↗
PubMed2006

Adherence to a Mediterranean diet is associated with reduced 3-year incidence of obesity.

Few studies have prospectively examined dietary patterns and adult weight change, and results to date are inconsistent. This study examines whether a Mediterranean diet (MD) pattern is associated with reduced 3-y incidence of obesity using data from the Spanish cohort of the European Prospective Investigation into Cancer and Nutrition (EPIC-Spain). The sample included 17,238 women and 10,589 men not obese and aged 29-65 y at baseline (1992-96). Height and weight were measured at baseline; weight was self-reported in a follow-up survey a mean of 3.3 y later. Detailed dietary history data, collected using a validated method, were used to construct a MD score. Logistic regression models were used to estimate odds of becoming overweight or obese. Among initially overweight subjects, 7.9% of women and 6.9% of men became obese, whereas 13.8% of normal weight men and 23.0% women became overweight. High MD adherence was associated with significantly lower likelihood of becoming obese among overweight subjects, with stronger associations after adjusting for underreporting of dietary data. Associations (odds ratios with 95% CI) were similar in women (0.69, 0.54-0.89) and men (0.68, 0.53-0.89). Adjusting for the plausibility of reported dietary intakes increased the magnitude of these associations, which were approximately 0.8 without this adjustment. MD adherence was not associated with incidence of overweight in initially normal-weight subjects. Nonetheless, results suggest that promoting eating habits consistent with MD patterns may be a useful part of efforts to combat obesity.

Adult↗
PubMed1994

The degree of dietary fatty acid unsaturation affects torpor patterns and lipid composition of a hibernator.

Diets rich in unsaturated and polyunsaturated fatty acids have a positive effect on mammalian torpor, whereas diets rich in saturated fatty acids have a negative effect. To determine whether the number of double bonds in dietary fatty acids are responsible for these alterations in torpor patterns, we investigated the effect of adding to the normal diet 5% pure fatty acids of identical chain length (C18) but a different number of double bonds (0, 1, or 2) on the pattern of hibernation of the yellow-pine chipmunk, Eutamias amoenus. The response of torpor bouts to a lowering of air temperature and the mean duration of torpor bouts at an air temperature of 0.5 degree C (stearic acid C18:0, 4.5 +/- 0.8 days, oleic acid C18:1, 8.6 +/- 0.5 days; linoleic acid C18:2, 8.5 +/- 0.7 days) differed among animals that were maintained on the three experimental diets. The mean minimum body temperatures (C18:0, +2.3 +/- 0.3 degrees C; C18:1, +0.3 +/- 0.2 degree C; C18:2, -0.2 +/- 0.2 degrees C), which torpid individuals defended by an increase in metabolic rate, and the metabolic rate of torpid animals also differed among diet groups. Moreover, diet-induced differences were observed in the composition of total lipid fatty acids from depot fat and the phospholipid fatty acids of cardiac mitochondria. For depot fat 7 of 13 and for heart mitochondria 7 of 14 of the identified fatty acids differed significantly among the three diet groups. Significant differences among diet groups were also observed for the sum of saturated, unsaturated and polyunsaturated fatty acids.(ABSTRACT TRUNCATED AT 250 WORDS)

Adipose Tissue↗
PubMedDate not supplied

Master Amino acid Pattern as substitute for dietary proteins during a weight-loss diet to achieve the body's nitrogen balance equilibrium with essentially no calories.

Results of this multicentric study have shown that by giving 10 g (10 tablets) of Master Amino acid Pattern (MAP) as a substitute for dietary proteins, once a day, to 114 overweight participants undergoing the American Nutrition Clinics/Overweight Management Program (ANC/OMP), the participants' nitrogen balance could be maintained in equilibrium with essentially no calories (MAP 1 g=0.04 kcal), thereby preserving the body's structural and functional proteins, eliminating excessive water retention from the interstitial compartment, and preventing the sudden weight increase after study conclusion commonly known as the yo-yo effect. Study results have shown that the use of MAP, in conjunction with the ANC/OMP, has proven to be safe and effective by preventing those adverse effects associated with a negative nitrogen balance, such as oversized or flabby tissue, stretch marks, sagging of breast tissue, increased hair loss, faded hair color, and fragile or brittle nails. Also preventing those anomalies commonly associated with weight-loss diets, such as hunger, weakness, headache caused by ketosis, constipation, or decreased libido, the use of MAP, in conjunction with the ANC/OMP, allowed for mean weight loss of 1.4 kg (3 lb) per week.

Adolescent↗
PubMed2001

The macrobiotic diet in cancer.

Macrobiotics is one of the most popular alternative or complementary comprehensive lifestyle approaches to cancer. The centerpiece of macrobiotics is a predominantly vegetarian, whole-foods diet that has gained popularity because of remarkable case reports of individuals who attributed recoveries from cancers with poor prognoses to macrobiotics and the substantial evidence that the many dietary factors recommended by macrobiotics are associated with decreased cancer risk. Women consuming macrobiotic diets have modestly lower circulating estrogen levels, suggesting a lower risk of breast cancer. This may be due in part to the high phytoestrogen content of the macrobiotic diet. As with most aspects of diet in cancer therapy, there has been limited research evaluating the effectiveness of the macrobiotic diet in alleviating suffering or prolonging survival of cancer patients. The few studies have compared the experience of cancer patients who tried macrobiotics with expected survival rates or assembled series of cases that may justify more rigorous research. On the basis of available evidence and its similarity to dietary recommendations for chronic disease prevention, the macrobiotic diet probably carries a reduced cancer risk. However, at present, the empirical scientific basis for or against recommendations for use of macrobiotics for cancer therapy is limited. Any such recommendations are likely to reflect biases of the recommender. Because of its popularity and the compelling evidence that dietary factors are important in cancer etiology and survival, further research to clarify whether the macrobiotic diet or similar dietary patterns are effective in cancer prevention and treatment is warranted.

Diet, Macrobiotic↗
PubMedDate not supplied

Food source makes a difference in diet quality.

OBJECTIVE: To examine the relationship between diet quality and source of food among U.S. adults. DESIGN: Cross-sectional sample of adults who participated in the 1994-1996 Continuing Survey of Food Intakes by Individuals divided into clusters based on their food source. SETTING: In-person interviews conducted nationwide. PARTICIPANTS: A national sample of 9407 adults over 18 years of age. METHOD: Data gathered from the interviews consisted of two 24-hour dietary recalls; self-reported demographic characteristics; body mass index (BMI); and health behaviors such as physical activity, smoking, and alcohol consumption. MAIN OUTCOME MEASURES: The United States Department of Agriculture (USDA) Healthy Eating Index (HEI) score and the percentage of total grams of food consumed from each source. ANALYSIS: Multivariate linear regression evaluated the association between food source pattern determined by cluster analysis, and HEI scores, while controlling for demographic characteristics, BMI, and health behaviors. RESULTS: Ten primary food source patterns were identified from the clusters. The food source clusters were statistically significant in predicting HEI score and were stronger predictors than most demographic and health behaviors included. IMPLICATIONS FOR RESEARCH AND PRACTICE: The success of cluster analysis in identifying food source patterns and associating them with diet quality suggests that identifying an individual's food source pattern may be more predictive of diet quality than demographic characteristics, and other health behaviors.

Adult↗
PubMed1982

The effects of vegetable and animal protein diets on calcium, urate and oxalate excretion.

A group of 30 meat eating normal subjects were compared with a second group of vegetarians matched for age and sex. Their diets and urinary excretion patterns were compared by statistical analysis. A link between protein intake, particularly animal protein, and urinary calcium excretion was demonstrated and also that dietary calcium was inversely related to urinary oxalate excretion. Urinary oxalate increases with the vegetable protein content of the diet, but within the limits of these diets, animal protein does not affect oxalate excretion though it does affect excretion of urinary urate.

Calcium↗
PubMed1991

In vivo regulation of low-density lipoprotein receptor and apolipoprotein B gene expressions by dietary fat and cholesterol in inbred strains of mice.

Two proteins that may be important in the hypercholesterolemia and atherosclerosis produced by dietary fat and/or cholesterol are apoB and the LDL-receptor. We evaluated the molecular and genetic regulation of these two proteins by two important components of atherogenic diets: dietary fatty acids and dietary cholesterol. The control diet (C) contained 5% corn oil; the high cholesterol (HC) diets, 5% corn oil plus 0.5% or 2% cholesterol; the high fat diet (HF) 1% corn oil and 20% hydrogenated coconut oil; the fat plus cholesterol diets (HF/C) were the same as HF diet plus either 0.5% or 2% cholesterol. Ten strains of inbred mice were fed the C and HF/C (2% cholesterol) diets. Three strains; C3H, C57BL and SWR, were studied in greater detail. In them the effects of dietary fat and cholesterol were assessed separately and together. These three strains were fed all six diets. Lipoprotein profiles of plasma and indexes of lipoprotein composition were obtained by gel filtration chromatography and in selected strains by gradient ultracentrifugation. Relative rates of transcription of LDL-receptor mRNA and apoB mRNA were measured in purified mouse liver nuclei and levels of LDL-receptor mRNA and apoB mRNA in liver and intestine were quantified by RNA excess solution hybridization assays. The HF/C diet produced rises in plasma total-, VLDL- and LDL-cholesterol and apoB concentrations in the ten strains. VLDL and LDL became cholesterol-enriched and the proportion of total cholesterol transported in VLDL and LDL rose at the expense of HDL. This general pattern of HF/C diet-induced changes was similar in all strains, but there were marked quantitative differences between strains with respect to lipid and lipoprotein concentrations, and compositions and the distribution of cholesterol on both the HC and HF/C diets. The strain-related differences were not due to differences in absorption of dietary cholesterol because, for any given diet, hepatic cholesterol levels increased to the same extent in all strains. Nor were the strain-related differences related to alleles of the apoB gene as determined by RFLP analyses. In the three strains, hepatic LDL-receptor mRNA transcription was suppressed by all diets. But, LDL-receptor mRNA levels in both intestine and liver were suppressed only by the HC and HF/C diets and not by the HF diet. Thus, dietary cholesterol decreased LDL-receptor mRNA levels by mechanisms operating at the transcriptional level, while dietary fatty acids, in addition to inhibiting transcription also appeared to enhance mRNA stability.(ABSTRACT TRUNCATED AT 400 WORDS)

Alleles↗
PubMed1979

Site of substrate stimulation of jejunal sucrase in the rat.

To identify the site of stimulation of sucrase by a sucrose diet, changes in sucrase-specific activity of jejunal mucosa were studied after introduction of sucrose diet to carbohydrate-deprived rats. Results were correlated with simultaneous changes in villus gradients of sucrase-specific activity. Simultaneous with the introduction of sucrose diet, [(3)H]thymidine (100 muCi) was administered intravenously, and rates of cell migration measured during adaptation to the new diet. After a 72-h fast, rats fed sucrose diet for 6, 12, or 18 h showed no change in sucrase-specific activity in either whole mucosa or villus gradients. However, within 18-24 h after starting a sucrose diet, there was a marked rise in whole mucosal sucrase-specific activity above fasting values (99 +/- 14 vs. 38 +/- 4 muM glucose/min per g protein, P < 0.001) in association with the development of a region of increased activity at the lower villus (154 +/- 22 vs. 60 +/- 9 muM glucose/min per g protein, P < 0.02, but with no change in villus tip activity (56 +/- 5 vs. 46 +/- 8 muM glucose/min per g protein). Similar changes were seen in animals fed 24 h of sucrose diet after a 72-h carbohydratefree diet. Fasted animals fed sucrose diet for 36 h had increased sucrase-specific activity at the villus tip (144 +/- 11 muM glucose/min per g protein) as well as at the lower villus region, and this pattern persisted at 1 wk of sucrose diet. Maximal activity patterns for isomaltase and maltase paralleled those for sucrase, but the villus gradients for lactase were unaffected by sucrose diet. The region of maximal sucrase-specific activity always coincided with or followed the leading edge of radioactivity as determined by liquid scintillation counting. Therefore, sucrose-mediated changes in sucrase activity of the jejunal mucosa in the rat appear to be initiated at the level of the crypt epithelial cell and are expressed after a latent period of 18-24 h during which these cells mature and migrate toward the villus tip.

Animals↗
PubMed1993

Effect of diets high in sodium and potassium on the magnitude of theophylline-induced hypercalciuria in the rat.

The effects of dietary sodium and potassium, given as salts of chloride or bicarbonate, on theophylline-induced hypercalciuria in the rat were investigated. In experiment 1, rats fed diets containing 0.3 mmol/g diet NaCl, KCl, NaHCO3, or KHCO3 exhibited a calciuria of NaCl > KCl > controls = NaHCO3 = KHCO3. This study indicated that cation effects were dependent on the accompanying anion, however the dose of added salt was inadequate to produce a consistent, significant salt effect. A second experiment was run in which animals were given salts at 0.4 mmol/g diet; the salt-induced pattern of calciuria was similar. After one week of salt pretreatment, rats were given diets containing theophylline (7.72 mumol/g diet), which induced calciuria all groups regardless of salt pretreatment. Urinary volume and urinary phosphate changes were parallel to each other and not to the changes in urinary calcium induced by salt or theophylline. Changes in urinary excretion of prostaglandin E2 were directly proportional to changes in urinary calcium. In the rat, pretreatment with sodium bicarbonate or sodium chloride reduces the extent of theophylline-induced diuresis, but does not reduce theophylline-induced hypercalciuria. Further, potassium chloride increases and potassium bicarbonate does not reduce urinary calcium excretion. Theophylline-induced calciuria is correlated with prostaglandin E2 excretion rates.

Animals↗
PubMed1989

A comparison of two diet history questionnaires that measure usual food intake.

This study was conducted during the preparation of a case-control study on patients with adenomatous polyps or cancer of the large bowel. It was done to compare two dietary history methods for assessing individual current dietary intakes. Subjects were interviewed concerning their food consumption by meal in one of the questionnaires and by broad food groups in the other questionnaire. Two groups of 20 volunteers, comparable according to sex and age, were interviewed by a dietitian who used one of the questionnaires. Data on diets obtained with the questionnaire were compared with those of a 14-day dietary record. The subjects were informed of the importance of the validation procedure. Whatever the type of questionnaire, mean daily intakes of nutrients and foods were rather similar for the questionnaires and for the 14-day records. Thus, there were more significant correlations between the questionnaire by meal and the record than between the questionnaire by food group and the record. When using tertiles, it appears that the questionnaire by meal was better at classifying individuals with regard to their food intake than the questionnaire by food groups. Although extrapolating these results to a patient population is not straightforward, it seemed likely that interviewing patients on diet without using a pattern of meals would prove even less reliable than for healthy subjects. The questionnaire by meal was preferred to the questionnaire by food groups for the ongoing case-control study. Further studies are needed to know whether these results could be extrapolated to studies on past diet and to non-Latin populations.

Adult↗
PubMed2000

Paleolithic vs. modern diets--selected pathophysiological implications.

The nutritional patterns of Paleolithic humans influenced genetic evolution during the time segment within which defining characteristics of contemporary humans were selected. Our genome can have changed little since the beginnings of agriculture, so, genetically, humans remain Stone Agers--adapted for a Paleolithic dietary regimen. Such diets were based chiefly on wild game, fish and uncultivated plant foods. They provided abundant protein; a fat profile much different from that of affluent Western nations; high fibre; carbohydrate from fruits and vegetables (and some honey) but not from cereals, refined sugars and dairy products; high levels of micronutrients and probably of phytochemicals as well. Differences between contemporary and ancestral diets have many pathophysiological implications. This review addresses phytochemicals and cancer; calcium, physical exertion, bone mineral density and bone structural geometry; dietary protein, potassium, renal acid secretion and urinary calcium loss; and finally sarcopenia, adiposity, insulin receptors and insulin resistance. While not, yet, a basis for formal recommendations, awareness of Paleolithic nutritional patterns should generate novel, testable hypotheses grounded in evolutionary theory and it should dispel complacency regarding currently accepted nutritional tenets.

Adaptation, Biological↗
PubMed1995

Factors associated with adherence to the dietary protein intervention in the Modification of Diet in Renal Disease Study.

OBJECTIVE: To determine the characteristics and behaviors associated with adherence to dietary protein interventions among participants with chronic renal disease in the Modification of Diet in Renal Disease (MDRD) Study. DESIGN: Participants were categorized as consistent adherers or nonadherers on the basis of urinary urea nitrogen excretion and dietary protein intake data from self-reports. Psychosocial and behavioral factors were compared between groups. SUBJECTS: Subgroups of consistently adherent and non-adherent participants in the MDRD Study. SETTING: 15 clinical centers in the United States. INTERVENTION: In the nutrition intervention program, participants were assigned randomly to a usual-, low-, or very-low-protein diet group. Each eating pattern also specified a phosphorus goal. STATISTICAL ANALYSIS: Analysis of variance. RESULT: Psychosocial factors significantly related to adherence included participant knowledge, attitude, support, satisfaction, and self-perception of success. Behavioral strategies including participant self-monitoring of protein intake and the provision of feedback by the dietitian were also significantly related to adherence. APPLICATION: Nutrition interventions for patients with renal disease should focus on psychosocial factors and behavioral approaches. Such approaches can be successfully incorporated into treatment programs and will assist the dietitian in promoting adherence to usual-, low-, and very-low-protein eating patterns.

Adult↗
PubMed1997

Effects of diet on sensitization to cocaine-induced stereotypy in female rats.

The progressive increase in cocaine-induced stereotyped behavior that accompanies repeated cocaine injections (sensitization) was examined in rats consuming different diets. Adult female Sprague-Dawley rats were fed one of three diets: low protein (6% casein), adequate protein (25% casein), or a standard chow diet. Following 1 week of adaptation to the diets, the rats were injected every 3-4 days with either cocaine (30 mg/kg, IP) or saline, and the total amount of stereotypy was measured over a 90-min interval following each of four injections. Cocaine-induced stereotypy peaked at 40-50 min following each injection, after which it declined for all diet groups. With repeated injections, the total amount of stereotypy increased in all diet groups. By the fourth injection, the low protein diet group (6% casein) exhibited a slower onset and a possibly prolonged duration of cocaine-induced stereotypy when compared with the two adequate protein diet groups (25% casein and chow). Interestingly, the rats in the two purified diet groups (6% casein and 25% casein) exhibited significantly more stereotypy across injections than those in the chow diet group. Weight differences did not explain the differences in stereotypy present among the diet groups. This study concludes that diet significantly alters the pattern of cocaine-induced stereotypy in female rats, especially after repeated exposure.

Animal Nutritional Physiological Phenomena↗
PubMed2003

Reproduction and survival in Mediterranean fruit flies: a "protein and energy" free radical model of aging.

We propose a "protein and energy" free radical model of aging that predicts patterns of survival and fertility curves for Mediterranean fruit flies. Mathematical and simulation models of individual physiological processes were constructed in terms of stochastic differential equations. The free radical theory of aging was used as a basis for construction of the model and was extended to describe the dynamics of the protein and energy balance in the functioning organism, including the concept of a maximum capacity for energy production. We fit the model to observed patterns of survival and fertility in flies given the basic diet schemes used in respective experiments. Age patterns of fertility and survival were predicted under various diet scenarios using the model, revealing that the predictions of the model are in good agreement with experimental data.

Aging↗
PubMedDate not supplied

In vivo regulation of rat epididymal proteins by retinoids: analysis by two-dimensional electrophoresis.

The role of retinoids in the regulation of epididymal fluid protein expression was investigated. We compared the patterns of two-dimensional electrophoretic gels of proteins from luminal fluids, cytosols and spermatozoa (from control rats only) of control, retinoid-depleted, retinoid-depleted retinoic acid-complemented and retinoid-depleted testosterone-supplemented rats. This study compared the luminal fluid patterns from the 4 diets and observed 13 proteins whose expression was dependent on nutritional status. Eight were either absent or very weakly expressed in retinoid-depleted animals only, while their presence was obvious in control rats and in the retinoid-deficient retinoic acid- and testosterone-complemented groups. The expression of 8 proteins was greatly enhanced in retinoid-depleted testosterone-supplemented fluids as compared to control fluids. Five of the regulated proteins seemed to be captured by spermatozoa as they were observed in sperm protein patterns of control rats. These results clearly show that the synthesis of several epididymal proteins is influenced by retinoids. Since testosterone-supplemented animals on retinoid-free diet elicited the same response as retinol and retinoic acid ones, testosterone is likely to be the mediator of retinoid action on epididymal protein synthesis. Nevertheless, the observation of one protein whose expression is stimulated by retinoic acid only and is totally independent of testosterone also favors the direct influence of this retinoid.

Animals↗
PubMed1997

Dietary pattern and 20 year mortality in elderly men in Finland, Italy, and The Netherlands: longitudinal cohort study.

OBJECTIVE: To investigate the association of dietary pattern and mortality in international data. DESIGN: Cohort study with 20 years' follow up of mortality. SETTING: Five cohorts in Finland, the Netherlands, and Italy. SUBJECTS: Population based random sample of 3045 men aged 50-70 years in 1970. MAIN OUTCOME MEASURES: Food intake was estimated using a cross check dietary history. In this dietary survey method, the usual food consumption pattern in the 6-12 months is estimated. A healthy diet indicator was calculated for the dietary pattern, using the World Health Organisation's guidelines for the prevention of chronic diseases. Vital status was verified after 20 years of follow up, and death rates were calculated. RESULTS: Dietary intake varied greatly in 1970 between the three countries. In Finland and the Netherlands the intake of saturated fatty acids and cholesterol was high and the intake of alcohol was low; in Italy the opposite was observed. In total 1796 men (59%) died during 20 years of follow up. The healthy diet indicator was inversely associated with mortality (P for trend < 0.05). After adjustment for age, smoking, and alcohol consumption, the relative risk in the group with the healthiest diet indicator compared with the group with the least healthy was 0.87 (95% confidence interval 0.77 to 0.98). Estimated relative risks were essentially similar within each country. CONCLUSIONS: Dietary intake of men aged 50-70 is associated with a 20 year, all cause mortality in different cultures. The healthy diet indicator is useful in evaluating the relation of mortality to dietary patterns.

Aged↗