【单选题】

According to the following passage, which of the following statements is true of international comparisons of overall fat intake

A、They provide a reasonable indicator of the health benefits of polyunsaturated fats.
B、They tend to conflate too many factors to provide an effective argument against reducing overall fat intake.
C、They are rife with subtleties too complex for most nutritionists to be able to understand properly.
D、They correctly tend to indicate the necessity for reducing overall fat intake reduction in affluent societies.
E、They tend to lend too much attention to non-dietary causes of coronary heart disease.