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Plasma lipid composition in an elderly population: correlation with dietary fat
J M Higueras1, J M Arias, F J Mataix
1Instituto de Nutrición y Tecnología de Alimentos, Universidad de Granada, Spain.
Summary
Elderly individuals consuming high-fat diets showed elevated plasma cholesterol. While dietary fatty acid intake generally correlated with plasma levels, only linolenic acid demonstrated a significant linear relationship in this study.
Area of Science:
- Gerontology
- Nutritional Science
- Lipid Metabolism
Background:
- Dietary fat significantly influences plasma lipid profiles, particularly in aging populations.
- Understanding the relationship between dietary fatty acids and their circulating levels is crucial for health management in the elderly.
- Previous research indicates variations in how different fatty acids are reflected in plasma composition.
Purpose of the Study:
- To investigate the impact of high dietary fat intake on plasma lipid composition in elderly Spanish subjects.
- To assess the correlation between specific dietary fatty acid intake and their corresponding plasma levels.
- To determine if plasma fatty acids serve as reliable biomarkers for dietary intake in this population.
Main Methods:
- A population of 51 elderly subjects (19 men, 32 women) residing in a Spanish retirement home were studied.
- Detailed dietary intake of total fat, specific fatty acids (oleic, linoleic, linolenic), and cholesterol was recorded.
- Plasma lipid composition, including total cholesterol, HDL-cholesterol, LDL-cholesterol, and circulating fatty acid profiles, was analyzed.
Main Results:
- Subjects consumed elevated levels of dietary fat, with oleic acid being the most abundant fatty acid.
- Plasma cholesterol levels were approximately 250 mg/dl, with HDL-cholesterol and LDL-cholesterol levels within specific ranges for both sexes.
- Palmitic, oleic, and linoleic acids were the most abundant circulating fatty acids, while linolenic acid was low.
- Higher dietary intake of fatty acids generally correlated with higher plasma levels, but only linolenic acid showed a significant linear correlation (p < 0.05).
Conclusions:
- High dietary fat intake in elderly individuals is associated with elevated plasma cholesterol levels.
- Plasma fatty acid levels partially reflect dietary intake, but the correlation strength varies significantly among different fatty acids.
- Linolenic acid appears to be a more reliable biomarker of dietary intake compared to other major fatty acids in this elderly population.