Such pronouncements carry almost the aura of nutritional religion: carved in stone, not to be questioned. But a few nutritionists and scientists are questioning this conventional wisdom.

• 这些说法仿佛已成为营养学界的金科玉律，有着不容挑战的权威性。然而，近年来，一些营养学家和科学家开始质疑这种传统观念。