Such additives as caffeine, preservatives and artificial colors are more things the body doesn't need. While they all may leave the body quickly, Hung says, this does not mean that they don't do any damage.
其他像咖啡因、防腐劑、人工色素等非人體所需的添加物，雖然多數會在短時間內排出體外，但洪建德指出，這些添加物是否對人體有害，並非取決於能否排除。