Inclusion Criteria:  SREBF1 C/G/G minor allele carriers and AA/CC/AA major homozygotes at rs2236513/rs2297508/rs4925119, age 18-25 years, body mass index (BMI) 18~23.9 kg/m2 , blood pressure within normal ranges (Systolic blood pressure < 140mmHg, diastolic blood pressure < 90mmHg), lipid profiles within normal ranges according to test kit instructions (fasting serum triglycerides < 1.7mmol/L, fasting serum total cholesterol < 5.2 mmol/L, fasting serum low density lipoprotein cholesterol (LDL-C) < 3.12 mmol/L, fasting serum high density lipoprotein cholesterol (HDL-C) >1.04 mmol/L ), liver and kidney functions within normal ranges according to test kit instructions (alanine aminotransferase (ALT) 9~50 U/L for male, 7~40 U/L for female; aspartate transaminase (AST) 15~40 U/L for male, 13~35 U/L for female; creatinine 62~115 μmol/L for male, 53~97 μmol/L for female; blood urea nitrogen (BUN), 1.43~7.14 mmol/L), both parents are Chinese Han nationality, willing to eat two or more eggs, and willing to maintain "Three Low Diet" except when they were given egg yolks during the study.  Exclusion Criteria:  History of diabetes, cancer, stroke, heart disease or any other known diseases, allergic to eggs, or having habits such as drinking or smoking.