美McNamara等最近做了一项研究。探讨了饮食中脂肪的质和胆固醇的量对内环境胆固醇稳定的影响。 实验分为两组。一组受试者接受富含饱和脂肪酸,P/S比例为0.5的饮食。另一组接受富含多不饱和脂肪酸,P/S比例为1.5的饮食。每一组实验期为12个星期。前六个星期为低胆固醇实验期(200～300mg/天),后六个星期为高胆固醇实验期(800～900mg/天)。 A recent study by the United States, McNamara et al. The effects of dietary fat mass and cholesterol on the stability of cholesterol in the environment were investigated. The experiment is divided into two groups. One group of subjects received a diet rich in saturated fatty acids with a P / S ratio of 0.5. The other group received a diet rich in polyunsaturated fatty acids with a P / S ratio of 1.5. Each experiment period is 12 weeks. The first six weeks were low cholesterol (200-300 mg / day) and the last six weeks were high cholesterol (800-900 mg / day).