The breast cancer/dietary fat relationship, once a key point in getting American women to switch their eating habits, has now been seriously challenged.
A prominent Harvard study of nearly 90,000 American nurses, backed up by somewhat similar studies from other laboratories, has shown no relationship between the risk of breast cancer and the amount of fat we eat.
While it may be tempting for many women to ease off their diet regimes, the relationship between dietary fat and cancer should not be idly dismissed. The problem is that the Harvard study, although well executed, is very narrowly focused, leaving many women understandably confused. A clue to alleviating this confusion may be found when the Harvard data are compared with our findings from rural China. Contrary to Harvard’s conclusions, we found a significant association between dietary fat and breast cancer.
Harvard Study vs. China Project
The Harvard study compared nurses who ate “low-fat” diets with nurses who consumed higher fat diets. Total fat intake ranged from a modest level of 25% to as much as 45% of calories. According to evidence available in other reports, however, the women who consumed the lower amounts of fat, ate so-called “low-fat” foods such as leaner meats, low-fat milk, and low-fat dressings and spreads. Needless to say, they still indulged in eating large amounts of animal-based foods, rather than adding more fruits and vegetables to their diets.
Considerable evidence indicates this may be a formula for failure. The data from rural China, for example, depart from the Harvard data in several important ways. First, we compared people who ate diets containing fat ranging from 6% to 25% of calories (instead of 25-45%). Unlike participants in the Harvard research, we discovered that people in [...]