In this study the investigators aimed at measuring the effect of a two-week high-fat/high-cholesterol (HFHC) normocaloric diet on HDL particles biochemical composition and HDL function compared to a two-week low-fat/low-cholesterol (LFLC) normocaloric diet.

HDL particles can change their composition and function in response to a variety of pathological conditions and environmental stimuli. It has been previously shown that a western diet is able to drastically modify biochemical composition, anti-inflammatory and anti-oxidant properties of HDL in animals. In humans little is known on the role of diet on HDL function and composition.

Inclusion Criteria:

• Subjects ≥ 18 and ≤40 years of age
• Lean or overweight (BMI: 18 to 29,9 kg/m2)
• Normal liver and kidney function
• Normal thyroid function
• Stable weight in the last 3 months
• Read and understood the informed consent form and signed it voluntarily

Exclusion Criteria:

• Liver, heart, kidney, lung, infectious, neurological, psychiatric, endocrine, immunological or neoplastic diseases
• Chronic use of drugs or vitamin supplements
• Smoking
• Pregnancy or lactation