Effects of Short-Term Diet on HDL Composition and Function

Eligibility Details: Inclusion Criteria: - 19-30 years old (women and men) - Weigh 133 pounds (60.5kg) or more - Currently consuming fast food 4 times per week or less - Categorized in "any" of the following BMI ranges: 1. BMI: 18.5-25 kg/m², for the group of healthy subjects with optimal body weight 2. BMI: 26-35 kg/m², for the group of overweight/obese subjects - Willing to consume a healthy diet (i.e. low saturated fat, low refined carbohydrate, high fruit and vegetable, high fiber) for 4 days. - Willing to consume a fast food diet (i.e. high saturated fat, high refined carbohydrate, low fruit and vegetable, low fiber) for 4 days, including a beef burger twice a day - Willing to bring all unfinished food (except beverages) back to Ragle facility in a plastic Ziploc bag. - Willing to bring in receipts from fast food purchases Exclusion Criteria: - Smoker - Anemia - Food allergies - Intolerance to dairy or gluten - Pregnant or lactating - Irregular menstrual cycle - Change in hormonal contraceptive use within the previous 3 months - Documented chronic diseases including diabetes, thyroid disease, metabolic syndrome, cancer (active), or previous cardiovascular events - Current consumption more than 1 alcoholic drink/day - Current consumption of fast food more than 4 times per week - Fish consumption greater than or equal to 3 times per week - Extreme dietary or exercise patterns - Recent weight fluctuations (greater than 10% in the last six months) - Taking prescription lipid medications (e.g. statins) or other supplements known to alter lipoprotein metabolism such as isoflavones. - Visit 1 baseline glucose: >100 mg/dL - Regular use (> 1 time per week) of allergy or pain medications