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Results for “postprandial hyperlipidemia”

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8 recordsLinked to original sources
PubMed1979

Changes in plasma very low density and low density lipoprotein content, composition, and size after a fatty meal in normo- and hypertriglyceridemic man.

Four subfractions of plasma VLDL characterized by decreasing Sf value and LDL were isolated by density gradient preparative ultracentrifugation from normotriglyceridemic (NTG) and hypertriglyceridemic (HTG) (type IV) subjects in the fasting state and after a fatty meal. Chemical analysis and computation of numbers of particles in each fraction showed that the hyperlipidemia of type IV subjects was accounted for by an increase in total numbers of VLDL and a shift in the distribution of VLDL towards particles of larger diameter. Postprandial hyperlipidemia was due to the presence of chylomicron remnants rather than intact chylomicrons, and was accounted for by an increase in particle diameter of the largest VLDL subfraction rather than by an increase in particle numbers. Postprandial hyperlipedemia was accompanied by a shift in the distribution of VLDL towards particles of larger diameter in both NTG and HTG subjects, probably because of competition for the triglyceride-depletion process between chylomicrons and hepatic VLDL. Most chylomicron remnants were removed from the circulation without degradation to smaller VLDL or to LDL, but some remnants were sufficienty small to contribute to smaller VLDL subfractions. The LDL of type IV subjects contained more apoprotein B than those from NTG subjects, and this difference was associated with increases in diameter, molecular weight, density, and the ratio of protein: phospholipid in LDL from type IV subjects. Defective degradation of large VLDL to small VLDL, and of VLDL to LDL may be related to this alteration in apoprotein B content of the lipoproteins in type IV subjects.

Apolipoproteins↗
PubMed2026

Lipidomic Profiling Reveals Differential Behaviors of Individual Free Fatty Acids During Altered Metabolic States in Rats.

We used lipidomic analyses to investigate how individual free fatty acids (FFAs) behave differently in metabolic states altered by diet and by antibiotic treatment (ABX) that depletes gut bacteria. Wistar rats were fed either a low-fat or high-fat purified diet, or standard chow with or without antibiotics for two weeks (n = 8-10). Blood samples were then collected before and after meals. Individual FFAs were quantified and grouped based on distinct postprandial response patterns across dietary and treatment conditions. Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), key ω-3 FFAs, exhibited postprandial shifts suggestive of suppressed adipocyte lipolysis following meals. Fatty acids in the high-fat diet (HFD) elevated postprandial FFA levels, masking the meal-induced suppression of lipolysis observed with chow or low-fat diet (LFD). Some FFAs, including medium-chain saturated species, remained unaffected by meals. We further evaluated the impact of diet and ABX on baseline (pre-meal) concentrations of FFAs. Certain FFAs were altered by purified diets compared to standard chow. Notably, EPA and DHA were selectively depleted under HFD conditions, likely due to enhanced catabolic activity. In conclusion, lipidomic profiling revealed divergent behaviors among individual FFAs, reflecting distinct metabolic processes and regulatory mechanisms under altered metabolic states.

Animals↗
PubMed1979

Dietary fibre, diabetes, and hyperlipidaemia. Progress and prospects.

When diabetes and cardiovascular disease were first classed as possible fibre-deficiency diseases, laboratory and clinical evidence was lacking. Subsequent studies indicated that the gums and viscous types of fibre (e.g., guar and pectin) are more effective than other fibres in slowing carbohydrate absorption and hence in reducing the postprandial rise in blood glucose and serum insulin. This effect has longer term metabolic consequences. In addition, gums and viscous fibres reduce serum cholesterol, possibly by mechanisms other than simply increasing bile-salt loss. If these potential therapeutic effects of fibre are to be exploited, palatable formulations must be developed. The effect of fibre in whole foods should also be determined.

Anticholesteremic Agents↗
PubMed1976

Postprandial plasma triglyceride and cholesterol responses to a low-fat meal.

Postprandial plasma cholesterol and triglyceride (TG) levels were measured after the consumption of a relatively low-fat (35% of calories) diet in 41 subjects. Plasma cholesterol levels did not change appreciably during the postprandial state. In 34 subjects a biphasic plasma TG response curve was noted, with an initial peak occurring 1 to 3 hr after feeding and a secondary TG peak 4 to 7 hr after the meal. The primary peak was greater than 90%, accounted for by chylomicrons, whereas the secondary peak represented very low-density lipoproteins (greater than 82%). Furthermore, the heights of the primary and secondary peaks were closely correlated to the fasting TG level (r = 0.61 and 0.72, respectively) indicating that the fasting TG concentration is an important determinant of the postprandial TG response. Because low-fat (high-carbohydrate) diets are known to raise fasting TG levels in patients who do not have fasting hyperchylomicronemia, and because relatively few patients have chylomicrons in the fasting state, these data suggest that such diets may lead to day long increases in plasma TG levels in the majority of subjects.

Adult↗
PubMed1977

[Diurnal patterns of plasma lipids and lipoproteins in primary endogenous hypertriglyceridemia (type IV-hyperlipoproteinemia) (author's transl)].

Acute and chronic effects of three isocaloric diets on plasma lipids and plasma lipoproteins were studied in 10 patients with primary endogenous hypertriglyceridemia (type IV-hyperlipoproteinemia). The diets used contained 20% protein, 50, 37 and 1% fat and 30, 43 and 79% carbohydrates respectively. Cholesterol levels were similar with all diets. Fasting values of plasma triglycerides were lower with the fat-containing diets compared to the high-carbohydrate diet. Diurnal patterns, however, were significantly higher with the former diets in 8 of the 10 patients. Postprandial lipoprotein patterns on fat-containing diets are characterized by chylomicronemia and marked changes of concentration and composition of other lipoprotein classes. If, analogous to diabetic therapy, control of hypertriglyceridemia is meant to imply low all-day levels rather than low fasting levels, a rather low-fat, high-carbohydrate diet seems to be superior in most patients with endogenous hypertriglyceridemia to diets containing more than 35 calorie per cent of fat.

Cholesterol↗
PubMed1978

Response of plasma triglycerides to dietary change in patients on hemodialysis.

The effect of reduction in dietary carbohydrate content of meal formula diets on plasma triglyceride concentrations was studied in 12 patients receiving chronic hemodialysis. Fasting plasma triglycerides decreased over a 10-day period in 11 of 12 patients in response to a decreased proportion of carbohydrate (from 50 to 35% of total daily calories) regardless of the type of fat used. Postprandial insulin responses were also significantly lower in the patients on the diets lower in carbohydrate. In addition, triglyceride kinetics were studied in three groups of patients. Patients with renal failure (dialyzed and undialyzed) had lower triglyceride production rates than those of control subjects, despite higher plasma triglyceride concentrations. Elevated (greater than 150 mg/100 ml) fasting plasma triglycerides are associated with lower triglyceride production rates in patients with chronic renal failure and may not be improved by conventional hemodialysis. A long-term study of the efficacy of reduction in dietary carbohydrate on plasma triglycerides is needed since routine hemodialysis does not appear to correct the lipid abnormality in patients with chronic renal failure.

Adult↗