High density lipoproteins unaffected by dietary fat modification

Area of Science:

• Cardiovascular Health
• Nutritional Science
• Lipid Metabolism

Background:

• High polyunsaturated to saturated fat (P/S) ratio diets may adversely affect high-density lipoprotein (HDL) cholesterol.
• Investigating the impact of moderately modified fat diets on lipid profiles is crucial for cardiovascular health.

Purpose of the Study:

• To evaluate the effects of a moderately modified fat diet (P/S ratio 1.0) on lipid profiles in healthy male volunteers.
• To assess the impact on low-density lipoprotein (LDL) cholesterol, HDL cholesterol, and related lipoproteins.

Main Methods:

• A 3-month cross-over study involving 30 healthy males comparing a modified fat diet (P/S ratio 1.0, 250 mg cholesterol/day) with a control diet (P/S ratio 0.3, 370 mg cholesterol/day).
• Dietary adherence was monitored through serum cholesteryl ester linoleic acid content, dietary recalls, and body weight maintenance.

Main Results:

• Significant reductions in LDL cholesterol (19% and 13%) were observed in both groups after 3 months on the modified fat diet, with effects noted as early as 4 weeks.
• Apolipoprotein A-I (Apo A-I) and total cholesterol in serum, including HDL2 and HDL3 subfractions, remained unchanged.
• The ratio of LDL to HDL cholesterol decreased, indicating a favorable shift in lipid profile.

Conclusions:

• A moderately modified fat diet, achievable through general food sources, is suitable for long-term consumption.
• This dietary pattern effectively lowers LDL cholesterol, even in individuals with normal lipoprotein levels (normolipoproteinemic subjects).
• The diet demonstrated no adverse effects on HDL cholesterol levels, supporting its cardiovascular benefits.