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PubMed1995

Repression of fat-dependent intestinal apo A-IV mRNA abundance by medium chain triacylglycerols and proteins, and elevation by carbohydrates of fat-dependent apo A-IV transport in suckling rat pups.

Nutrients regulating intestinal apo A-IV synthesis and secretion in developing rats have not been clearly defined. We examined the effect of ingestion of fats, carbohydrates and proteins on the abundance of intestinal apo A-IV mRNA and the serum concentration of apo A-IV in 14-day-old suckling rat pups fasted overnight. In pups ingesting long-chain fatty acid-fat (soybean oil, triolein: LCT), there was a prompt elevation of the mRNA at 1.5 h after ingestion, although a graded dose of soybean oil did not result in a comparable elevation of the apo A-IV mRNA. In pups on MCT, but not trilaurin, there was a repression of the LCT-dependent elevation of the message. In pups on Intralipid (composed of soybean oil, lecithin and glycerol), mRNA was elevated at 6 h after ingestion. Administration of Intralipid with lactose, glucose, fructose and sucrose induced a rapid elevation of mRNA together with elevation of serum apo A-IV, although administration of casein, whey proteins and soybean proteins resulted in repression of the Intralipid-dependent mRNA elevation. The message correlated weakly to the serum apo A-IV and triacylglycerols and with no correlation to intestinal fat accumulation. These results suggest that metabolic events following the ingestion of milk components modulate intestinal apo A-IV expression in developing rats, possibly through mucosal fatty acid utilization.

Animals↗
PubMed1995

Reduced inter- and intrasubject variability in cyclosporine pharmacokinetics in renal transplant recipients treated with a microemulsion formulation in conjunction with fasting, low-fat meals, or high-fat meals.

This cross-over study compared the pharmacokinetic parameters obtained from cyclosporine (CsA) concentration-time profiles after administration of the corn oil-based soft gel cap (CsA-GC) with those with the microemulsion (CsA-ME) gel cap. Neither the fasting state nor the coadministration of a low- or high-fat breakfast affected the pharmacokinetics of CsA presented in either formulation. Comparisons of the three sets of pharmacokinetic parameters--namely, after fasting or after low-fat or after high-fat diets--demonstrated the CsA-ME formulation to display greater intraindividual reproducibility of the C0 and C12 trough levels (TLs), Cmax, tmax, and area under the concentration-time curve (AUC) than the CsA-GC formulation. Although the degree of interindividual variation in AUC, Cmax and tmax after CsA-ME administration was slightly, but significantly, less than after CsA-GC administration, there was no difference between the two formulations in terms of the customarily monitored C0 or C12 TL values. CsA-ME showed higher correlation coefficients of drug exposure (AUC) with C12 than CsA-GC (0.910 versus 0.712). However, CsA-ME administration resulted in only modest improvement over CsA-GC administration in the relationships between drug dose and C0, C12, or AUC--namely, 0.645 versus 0.496, 0.611 versus 0.517, and 0.700 versus 0.501, respectively. Correlation analysis between individual timed samples and AUC determinations revealed that CsA-ME requires significantly less frequent blood monitoring for prediction of total drug exposure than does CsA-GC. Although the clinical utility of this reproducible pharmacokinetic behavior remains to be demonstrated in the de novo transplant setting, the markedly reduced intraindividual variation produced by administration of CsA-ME will likely improve the accuracy of pretransplant prediction of, and reduce the frequency of subsequent adjustments in, CsA doses.

Corn Oil↗
PubMed1998

[Norwegian dietary habits--from low-fat poverty food to low-fat welfare food].

Norwegian society has undergone major changes in the 20th century, also with regard to its dietary habits. During the first half of the century dietary changes were characterised by a substantial decrease in the consumption of cereals and an increase in the use of margarine and other foods rich in fat. In the past 30 years there has been a major decrease in the consumption of potatoes, margarine and butter, a change from fatty to skimmed types of milk, and an increase in the consumption of fruit, vegetables, meat, cheese, fatty snacks, and soft drinks. These changes were responsible for a rise in dietary fat content from approximately 20 to 40 E% during the first half of the century and a decrease to 30-34 E% during the last 20 years. Todays average diet contains satisfactory amounts of most nutrients. However, vitamin D levels are somewhat low, and among women of fertile age iron and folate intake is lower than recommended. Moreover, fat, sugar, salt, and alcohol content is higher than desirable, whereas fibrecontent is too low.

Adult↗
PubMed1978

[Determination of trace elements in dietary fats and emulsifiers by flameless atomic absorption spectrophotometry. 1. Determination of the ionogenically bound heavy metals copper, iron, nickel, zinc, lead and cadmium in dietary fats].

The knowledge of the trace metal contents in dietary fats is of considerable interest from the viewpoints of food hygiene and and storage stability. In the framework of the present paper, it is dealt with the determination of the ionogenically bound heavy metals copper, iron, nickel, zinc, lead and cadmium by means of flameless atomic absorption spectrometry (AAS). Problems related to trace analysis in dietary fats are discussed. Problem-oriented surveys in the form of tables inform about:--analytical conditions of the AAS technique,--metal contents as compared to data with the approved standard method,--contents of the ionogenically bound toxic trace elements cadmium, zinc and lead in samples of various dietary fats currently used in the German Democratic Republic.

Cadmium↗
PubMed1988

Effect of interesterified dietary fat mixtures on various lipid indices and liver metal content of rats in fat-metabolism disturbance.

Adult male and female Wistar rats were fed isoenergetically for a 6 week period with a lipogenic diet containing a 20% fat mixture which caused fat-metabolism disturbance. One group consumed the mixture of sunflower oil and lard in a ratio of 0.91 P/S, the other group the interesterified form of the same mixture. The linoleic acid content of the mixtures was 0.4%. The fat mixture of the third group's diet was adjusted with soya oil to a linoleic-acid content of 0.8%. The results were compared to the control data obtained in rats fed with a normal diet. The changes in various lipid indices of the serum and the liver and the levels of some metals in the liver were analysed. It was found that; in comparison to the control on the effect of the lipogenic diet the total lipid and cholesterol contents of the serum increased significantly in all groups (a significantly higher value being observed for the females than for the males) whereas the HDL-C content decreased.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1988

Alteration of liver microsomal monooxygenases and substrate competition with aniline hydroxylase from rats chronically fed low-fat and high-fat-containing alcohol diets.

Male Sprague-Dawley rats fed ethanol (EtOH) 36% of total calories for four weeks in a liquid diet containing either 34% (HF) or 12% (LF) of calories as fat were studied with respect to induction of microsomal monooxygenases (MFO) and substrate competition with EtOH-inducible aniline hydroxylase. The specific activity and turnover of aniline hydroxylase were induced to similar extents by HF-EtOH and LF-EtOH diets. Whereas, both LF-EtOH and HF-EtOH caused a decrease in the turnover of arylhydrocarbon (benzo[a]pyrene) hydroxylase (AHH) and aldrin epoxidase compared to pair-fed (PF) controls, LF-EtOH but not HF-EtOH increased the turnover of ethoxycoumarin and ethoxyresorufin O-deethylase (ECOD and EROD). The increase in ECOD and EROD and the decrease in AHH by EtOH is contrary to the parallel induction of these activities by 3-methylcholanthrene (3-MC) and Aroclor 1254 (Aroclor). Benzo(a)pyrene (BaP) stimulated aniline hydroxylase in the HF-EtOH and PF systems, whereas with LF diet, stimulation was seen only in the EtOH group. Ethoxycoumarin (EC) inhibited aniline hydroxylase by microsomes from EtOH- and pyrazole-treated rats, whereas it stimulated aniline hydroxylase by control microsomes, suggesting that the EC effects were associated with EtOH-inducible cytochrome P-450. Ethoxyresorufin (ER) inhibited aniline hydroxylase in EtOH and PF groups, thus the differential effects of EC were not nonspecific O-deethylase effects. The effects of EtOH feeding on ECOD, EROD, and AHH (ie, substrates for 3-MC-inducible cytochrome P-450) displayed a greater differential between the experimental and control group with the LF- than with the HF-containing diet. The findings suggest that the alteration of certain MFO activities by chronic EtOH ingestion can be modified by the content of dietary fat. Moreover, the competition dynamics of MFO substrates toward EtOH-inducible aniline hydroxylase are altered by EtOH feeding and, in turn, modified by dietary fat.

Aniline Hydroxylase↗
PubMed1982

Uptake of fat by fluorescent granular perithelial cells in cerebral cortex after administration of fat rich chow.

As reported previously, fluorescent granular perithelial cells (F.G.P.) are distributed along small blood vessels, possibly postcapillary venous vessels, in the cerebral cortex; these cells take up intraventricularly administered horseradish peroxidase efficiently. In this study it is shown that lipid substances of the blood are easily incorporated into F.G.P. and stored in their cytoplasm. The quantity of fat deposits in F.G.P. varies with the age of the animal and is very marked in old rats. The administration of elastase suppresses the fat uptake and/or facilitates the fat metabolism in F.G.P.

Aging↗
PubMed1981

Differential diagnosis of maldigestion and malabsorption of fat. I. Comparison of the radioactivity of triglyceride and non-esterified fatty acid in fecal fat using purified 131I-triolein.

To differentiate maldigestion from malabsorption of fat, we compared the radioactivity of triglyceride with non-esterified fatty acid in fecal fat after ingestion of radiochemically purified 131I-triolein. A large amount of radioactivity was present in the triglyceride fraction from patients with pancreatic insufficiency, while such was found only in non-esterified fatty acid fraction in patients with short bowel syndrome, as determined by thin-layer chromatogram scanning. Thus, the "Digestion-Absorption Index" was calculated as a ratio of the radioactivity of triglyceride to that of non-esterified fatty acid. Mean Digestion-Absorption Index was 0.946 in the maldigestive group, and 0.045 in the malabsorptive group, and there was a statistical significance. However, an overlap in a few cases was confirmed in the area of 0.10 +/- 0.02, when this index was plotted on a table of semilogarithms. We assumed that this overlap was chiefly the result of maldigestion plus malasorption of fat.

Adult↗
PubMed1988

Milk fat globules: fatty acid composition, size and in vivo regulation of fat liquidity.

Populations of large and small milk fat globules were isolated and analyzed to determine differences in fatty acid composition. Globule samples were obtained by centrifugation from milks of a herd and of individual animals produced under both pasture and barn feeding. Triacylglycerols of total globule lipids were prepared by thin layer chromatography and analyzed for fatty acid composition by gas chromatography. Using content of the acids in large globules as 100%, small globules contained fewer short-chain acids, -5.9%, less stearic acid, -22.7%, and more oleic acids, +4.6%, mean values for five trials. These differences are consistent with alternative use of short-chain acids or oleic acid converted from stearic acid to maintain liquidity at body temperature of milk fat globules and their precursors, intracellular lipid droplets. Stearyl-CoA desaturase (EC 1.14.99.5), which maintains fluidity of cellular endoplasmic reticulum membrane, is suggested to play a key role in regulating globule fat liquidity. Possible origins of differences between individual globules in fatty acid composition of their triacylglycerols are discussed.

Animals↗
PubMed2004

Adolescents eating diets rich in either lean beef or lean poultry and fish reduced fat and saturated fat intake and those eating beef maintained serum ferritin status.

Reducing red meat intake to lower serum cholesterol may also lower iron and zinc intake. Eighty-six seventh and eighth graders who enrolled in a study comparing serum ferritin, zinc, and cholesterol levels were randomized to a low-fat eating pattern emphasizing either lean beef or lean poultry and fish. Serum data and three 24-hour recalls were collected at baseline and 3 months. The lean beef group ate significantly more beef [26 (4, 37) g/d; P<.01] and both groups reduced total and saturated fat intake. Although serum ferritin level change between baseline and intervention was significantly different between the lean beef and lean poultry and fish groups (median [interquartile range] 0.7 [-6, 8] and -6.8 [-12, 2] microg/dL, respectively), the drop in the lean poultry and fish group was not clinically significant. No differences were observed in iron and zinc intake or in serum zinc and cholesterol levels. Teenagers eating diets low in saturated fat may benefit from adequate amounts of lean red meat.

Adolescent↗
PubMed2004

A case of fat necrosis after breast quadrantectomy in which preoperative diagnosis was enabled by MRI with fat suppression technique.

A 63-year-old woman was found to have a left breast mass after quadrantectomy and radiation for bilateral breast cancer on postoperative cyclic examination. Intramammary recurrence could not be excluded by physical examination, mammography, or ultrasound examination. MR imaging with fat suppression technique revealed an oil-containing lesion, indicating fat necrosis. It was confirmed histologically that the mass-forming lesion included no cancer tissue. MR imaging with fat suppression technique appears to be a promising method for identification of postoperative mass lesions of the breast.

Breast Diseases↗
PubMed2003

Insulin sensitivity is increased and fat oxidation after a high-fat meal is reduced in normal-weight healthy men with strong familial predisposition to overweight.

OBJECTIVE: To evaluate whether postprandial abnormalities of energy expenditure and/or lipid oxidation are present in healthy, normal-weight subjects with a strong family history of obesity and thus at high risk to become obese. DESIGN: Case-control study. SUBJECTS: A total of 16 young healthy men participated in the study. Eight subjects had both parents overweight (father's and mother's body mass index (BMI) >25 kg/m(2)) and eight had both parents with normal body weight (father's and mother's BMI<25 kg/m(2), respectively). The group of subjects with overweight parents was similar to that with normal-weight parents (control group) in terms of BMI (23.7+/-1.7 vs 22.7+/-1.1 kg/m(2)) (M+/-s.d.) and fat-free body mass (FFM) (60.5+/-4.9 vs 58.4+/-2.0 kg), but was slightly older than the control group (25.4+/-3.3 vs 22.7+/-2.4 y; P<0.05). MEASUREMENTS: Energy expenditure (EE) was measured by indirect calorimetry, and blood samples were taken for the evaluation of metabolic variables in the fasting state and every hour for 8 h after a standard fat-rich meal (protein 15%, carbohydrate 34%, fat 51%, 4090 kJ). RESULTS: Fasting plasma glucose, cholesterol, HDL-cholesterol, triglyceride, free fatty acid (FFA) and leptin concentrations were similar in both groups of participants, but subjects with overweight parents has significantly lower plasma insulin concentrations (5.11+/-0.51 vs 7.07+/-1.56 microU/ml; P<0.007) and HOMA index of insulin resistance (1.1+/-0.1 vs 1.6+/-0.4; P<0.01). Postprandial plasma glucose, triglyceride, FFA and leptin concentrations were similar in the two groups, whereas insulin levels were significantly lower in the group with both parents overweight at 3, 5, 6, 7 and 8 h. Fasting and postprandial EE, and fasting lipid and carbohydrate oxidation were similar in both groups. On the contrary, postprandial carbohydrate oxidation (incremental area under curve) was significantly higher (196.25+/-94.75 vs 75.88+/-74.72 mg/kg FFM x 8 h; P<0.007) and that of lipid oxidation lower (90.93+/-80.32 vs 163.68+/-108.22 mg/kg FFM x 8 h; P<0.05) in the group of subjects with overweight parents. CONCLUSION: Normal-weight subjects with a strong family history of obesity present a reduced lipid oxidation in the postprandial period and a metabolic profile characterized by low plasma insulin levels and the HOMA index, which is compatible with increased insulin sensitivity. These metabolic characteristics may be considered as early predictors of weight gain and are probably genetically determined.

Adult↗
PubMed2004

Insulin sensitivity is increased and fat oxidation after a high-fat meal is reduced in normal-weight healthy men with strong familial predisposition to overweight.

OBJECTIVE: To evaluate whether postprandial abnormalities of energy expenditure and/or lipid oxidation are present in healthy, normal-weight subjects with a strong family history of obesity and thus at high risk to become obese. DESIGN: Case-control study. SUBJECTS: A total of 16 young healthy men participated in the study. Eight subjects had both parents overweight (father's and mother's body mass index (BMI) >25 kg/m(2)) and eight had both parents with normal body weight (father's and mother's BMI<25 kg/m(2), respectively). The group of subjects with overweight parents was similar to that with normal-weight parents (control group) in terms of BMI (23.7+/-1.7 vs 22.7+/-1.1 kg/m(2)) (M+/-s.d.) and fat-free body mass (FFM) (60.5+/-4.9 vs 58.4+/-2.0 kg), but was slightly older than the control group (25.4+/-3.3 vs 22.7+/-2.4 y; P<0.05). MEASUREMENTS: Energy expenditure (EE) was measured by indirect calorimetry, and blood samples were taken for the evaluation of metabolic variables in the fasting state and every hour for 8 h after a standard fat-rich meal (protein 15%, carbohydrate 34%, fat 51%, 4090 kJ). RESULTS: : Fasting plasma glucose, cholesterol, HDL-cholesterol, triglyceride, free fatty acid (FFA) and leptin concentrations were similar in both groups of participants, but subjects with overweight parents has significantly lower plasma insulin concentrations (5.11+/-0.51 vs 7.07+/-1.56 microU/ml; P<0.007) and HOMA index of insulin resistance (1.1+/-0.1 vs 1.6+/-0.4; P<0.01). Postprandial plasma glucose, triglyceride, FFA and leptin concentrations were similar in the two groups, whereas insulin levels were significantly lower in the group with both parents overweight at 3, 5, 6, 7 and 8 h. Fasting and postprandial EE, and fasting lipid and carbohydrate oxidation were similar in both groups. On the contrary, postprandial carbohydrate oxidation (incremental area under curve) was significantly higher (196.25+/-94.75 vs 75.88+/-74.72 mg/kg FFM x 8 h; P<0.007) and that of lipid oxidation lower (90.93+/-80.32 vs 163.68+/-108.22 mg/kg FFM x 8 h; P<0.05) in the group of subjects with overweight parents. CONCLUSION: Normal-weight subjects with a strong family history of obesity present a reduced lipid oxidation in the postprandial period and a metabolic profile characterized by low plasma insulin levels and the HOMA index, which is compatible with increased insulin sensitivity. These metabolic characteristics may be considered as early predictors of weight gain and are probably genetically determined.

Adult↗
PubMed2002

A low-fat diet has a higher potential than energy restriction to improve high-fat diet-induced insulin resistance in mice.

Previous studies have shown that energy restriction (ER) or low-fat (LF) diets have beneficial effects on high-fat (HF) diet-induced obesity and non-insulin-dependent diabetes. However, comparison between ER and low-fat diet regarding the effect on insulin resistance and lipid metabolism has not been reported. After inducing insulin resistance by HF feeding for 20 weeks, male C57BL/6J mice were divided into 3 groups. For a period of 12 weeks, group 1 received energy restriction (70% of ad libitum, HF diet), group 2 LF diet, and group 3 maintained on HF diet. Body weight and energy intake were reduced equally in ER and LF feeding. Plasma insulin levels were decreased on LF feeding, but were unchanged on ER, when compared with HF feeding. Glucose tolerance and insulin sensitivity tests revealed that insulin sensitivity was improved more efficiently by LF feeding than on ER. Plasma triglyceride (TG) levels were lower on LF feeding compared with ER and HF feeding. Measurement of hepatic very low-density lipoprotein (VLDL)-TG production revealed a lower production after LF diet feeding or ER compared with HF diet feeding. In summary, our data show that LF diet has a higher potential than ER to improve HF diet-induced insulin resistance, and that there is an association between improvement of insulin resistance and decrease of TG levels.

Animals↗
PubMed1984

Frequency and sequence complexity of liver poly(A)+ mRNAs from rats fed fat-free or high fat diets.

We demonstrate by messenger RNA (mRNA) . complementary DNA (cDNA) hybridization that nutrient variation can alter 1) the frequency in which entire classes or families of liver polyadenylated mRNAs [poly(A)+ mRNAs] are present within the cell and 2) the sequence complexity of those transcripts. Feeding a carbohydrate-rich, fat-free diet to rats for 5 days resulted in an increased sequence complexity of rare and moderately abundant liver poly(A)+ mRNAs when compared with poly(A)+ mRNA from rats fed high fat or basal diets. In addition, the frequency of reiteration of abundant sequences increased approximately 10 times compared with the abundant poly(A)+ mRNAs of rats fed high fat or basal diet. The results indicate that the functionality of the template is influenced by nutrient concentrations and may be one means by which complex organisms achieve homeostasis.

Animals↗
PubMed1993

A diet enriched in monounsaturated fats decreases low density lipoprotein concentrations in cynomolgus monkeys by a different mechanism than does a diet enriched in polyunsaturated fats.

To determine the mechanisms whereby dietary fat saturation influences LDL cholesterol and apolipoprotein B concentrations, 10 cynomolgus monkeys were fed each of three experimental diets enriched in saturated, monounsaturated or polyunsaturated fatty acids in a crossover design consisting of three 13-wk periods. Each diet contained 30% of energy as fat with 0.05 mg cholesterol/kJ and differed solely by the isocaloric substitution of fatty acids as 60% of total fat energy. The replacement of dietary saturated fatty acids with either mono- or polyunsaturated fatty acids resulted in significant reductions of plasma total cholesterol (-17% and -30%, respectively), HDL cholesterol (-32% and -41%, respectively), apoA-1 (-37% and -44%, respectively), and apolipoprotein B (-28% and -36%, respectively) concentrations. Additionally, when dietary polyunsaturated fatty acids were substituted for saturated fatty acids, a 27% reduction in VLDL + LDL cholesterol was significant. Metabolic experiments suggested that the significantly reduced concentrations of apolipoprotein B observed during the monounsaturated and polyunsaturated fatty acid phases relative to the saturated fatty acid phase could not be entirely explained by changes in LDL apolipoprotein B clearance but rather were likely due to decreased LDL apolipoprotein B production rates. However, enhanced LDL apolipoprotein B catabolism accounted for the even greater reductions in VLDL + LDL cholesterol and apolipoprotein B concentrations observed during the polyunsaturated fatty acid phase vs. the monounsaturated fatty acid phase. Our data suggest that monounsaturated and polyunsaturated fatty acids lower apolipoprotein B concentrations by distinct mechanisms, with polyunsaturated fatty acids affecting LDL apolipoprotein B catabolism as well as production.

Analysis of Variance↗
PubMed1995

Evaluation of fat utilization in paediatric Crohn's disease using 13C-labelled fat.

Carbon-13 breath tests provide a safe and noninvasive way of assessing nutrient absorption and utilization. Disordered protein and carbohydrate metabolism have been reported in children with Crohn's disease, but little is known about their fat utilization. To assess fat oxidation, 13C-Hiolein was administered to 11 children with active Crohn's disease (age range, 10.5-16.9 years; mean, 12.6) before and after treatment with steroids. Expired breath samples were collected at hourly intervals for 12 h, and 13CO2 excretion was measured by mass spectrometry. The mean 95% confidence interval (CI) time to peak 13CO2 excretion was 9 h (range, 7.73-9.97) before treatment and 6.95 h (range, 5.75-8.15) after treatment (p < 0.02). Mean 95% CI cumulative 13CO2 excretion up to peak time (7 h) was 47.53% (range, 24-69%) before treatment and 68.7% (range, 35-80.5%) after treatment with steroids (p < 0.02). Our results demonstrated impaired lipid utilization during active disease and improvement following steroid treatment. The oral 13C-Hiolein test is simple and noninvasive, and its results are reproducible. It provides a new method for estimating fat utilization in paediatric patients, along with the possibility of discriminating between patients with and without impaired utilization during the acute phase of the disease.

Adolescent↗
PubMed1976

Post-traumatic blood lipid changes and fat embolism. Relation of post-traumatic blood lipid changes and fat embolism syndrome.

Serum cholesterol, triglycerides, phospholipids, and lipoprotein levels were studied by electrophoresis in 43 trauma patients with multiple fractures of the lower extremities and pelvis. Ten healthy volunteers were used for control studies. The fat embolism syndrome was diagnosed in eight of the 43 patients. The lipid values of all the trauma patients were lower than the control values. A decrease in cholesterol and phospholipids was observed in the fat embolism patients during 4 days; these changes were not observed in the other trauma patients. The triglycerides of all the trauma patients increased slowly over a period of 4 days. Changes in the lipoprotein fractions after the trauma were minor. An early increase in the alpha1 lipbrotein fraction was noted in the fat embolism patients simultaneously with a decrease in the pre-beta lipoprotein fraction; the values of the other trauma patients were at the control levels. Normalization was observed in 6 hours. The lipid concentrations of plasma and serum did not change with filtration with 1.2, 5, and 8mum Millipore filters. No differences were noted between the femoral and cubital vein samples.

Adult↗