Related Experiment Videos
Cholesterol metabolism in juvenile baboons. Influence of infant and juvenile diets
Insights
Infant baboons breast-fed had higher cholesterol absorption as juveniles. Juvenile diets high in saturated fat or cholesterol significantly altered cholesterol metabolism and absorption rates.
Area of Science:
- Nutritional Science
- Metabolic Research
- Primate Studies
Background:
- Early life nutrition significantly impacts long-term health.
- Understanding cholesterol metabolism is crucial for cardiovascular health.
- The influence of infant and juvenile diets on cholesterol is not fully understood.
Purpose of the Study:
- To investigate the deferred effects of infant diets on juvenile cholesterol metabolism.
- To assess the impact of juvenile diets (cholesterol and fat type) on cholesterol metabolism.
- To quantify cholesterol absorption and turnover in baboons at 3.5 years of age.
Main Methods:
- Study involved 83 baboons fed different infant formulas or breast milk.
- Juvenile diets varied in cholesterol content and fat saturation (P/S ratio).
- Fecal isotopic methods measured cholesterol absorption and turnover; a two-pool model estimated metabolism variables.
Main Results:
- Juvenile baboons previously breast-fed showed higher cholesterol absorption than formula-fed.
- Infant formula cholesterol levels did not affect juvenile cholesterol metabolism.
- Saturated fats decreased cholesterol production, while high cholesterol intake altered various metabolic fluxes and pool sizes.
Conclusions:
- Early life feeding (breast milk vs. formula) has lasting effects on cholesterol absorption.
- Juvenile diet composition, particularly fat saturation and cholesterol levels, significantly modulates cholesterol metabolism.
- These findings highlight the critical role of diet in shaping cholesterol homeostasis from infancy through juvenile stages.
Abstract:
The deferred effects of infant diets and the effects of juvenile diets on cholesterol metabolism were estimated in 83 baboons (Papio sp.) at 3.5 years of age. As infants, the animals were breast-fed or fed one of three formulas containing approximately 2, 30, or 60 mg/dl cholesterol. After weaning at 14 weeks of age, the animals were fed one of four juvenile diets high or low in cholesterol with saturated (P/S = 0.37) or unsaturated (P/S = 2.1) fats. Cholesterol absorption and cholesterol turnover were measured by fecal isotopic methods, and variables of cholesterol metabolism were estimated from a two-pool model. Among juvenile animals breast-fed during infancy, the percentage of cholesterol absorption was higher, while the fluxes of cholesterol from Pool A (QAA, QA, and QAB) and the cholesterol mass of Pool B were lower, compared to those fed formulas. The level of cholesterol in formulas fed during infancy did not influence cholesterol metabolism during the juvenile period. During the juvenile period, saturated fat significantly decreased the cholesterol production rate (QA) and increased the rate constants for cholesterol flux between Pool A and Pool B (KAB and KBA) compared to unsaturated fat. High cholesterol intake increased bile acid and neutral steroid excretion, cholesterol turnover rate, the mass of Pool A, and the rate constant KA and fluxes QA and QAA for removal of cholesterol from Pool A. However, KAB, t1/2 B (half-time of Pool B), and the percentage of cholesterol absorbed were decreased.(ABSTRACT TRUNCATED AT 250 WORDS)