Post by MARIO on Feb 12, 2006 22:03:43 GMT -8
You bet I want fries with that
By Jeff Jacoby
Feb 13, 2006
I don't usually follow nutrition stories, but it was hard to miss last week's shocker about low-fat diets. Like many papers, The Boston Globe put it on Page 1, high above the fold: "Study finds no major benefits of low-fat diet." The study, a project of the National Institutes of Health, had taken eight years, cost $415 million, and involved nearly 49,000 older women, 40 percent of whom were assigned to a diet that kept their intake of calories from fat significantly below that of the other 60 percent. Researchers had expected to confirm what earlier studies and conventional medical wisdom had long suggested -- that consuming less fat is good for your health.
What they learned instead was that the women who dutifully cut back on fried foods, ice cream, and pizza ended up no better off than the women who ate whatever they wanted. The two groups developed breast cancer, colon cancer, heart attacks, and strokes at the same rates. Millions of Americans have been trying for years to reduce the fat in their diet -- eating bread without butter, salads without dressing, chicken without skin -- and now the largest study of the subject ever conducted says it has all been for naught. You could have had those fries after all.
And so once again we are reminded, as The New York Times sighed in an editorial on Thursday, that "the more we learn about nutrition, the less we seem to know." Does oat bran reduce cholesterol? Can dietary fiber prevent colon cancer? Are high doses of Vitamin E good for your heart? Once, the experts said yes. Then the experts said no. It sometimes seems that for every study that makes a nutritional claim, another study inevitably makes an equal and opposite claim.
Researchers can't even agree on whether eating less fat is the way to lose weight. Some insist that obesity is caused by ingesting too much fat, making a low-fat diet the key to shedding pounds. Others claim that reducing fat leads to overconsumption of carbohydrates -- and that it's carbs, not fat, that make people gain weight. Which theory did the massive new study confirm? Neither. Apparently there is still no clear-cut answer -- not even for $415 million.
But clear-cut answers are just what so many Americans want, and what so many of them think science ought to be able to provide. There is a seemingly inexhaustible willingness to believe that the voice of science is the voice of truth -- impartial, incorruptible, and unambiguous. It isn't, of course. Scientists are no less vulnerable to error or bias or ego than the rest of the human race. Scientists too can blunder or act from ulterior motives or convince themselves of things that aren't so. And yet on the whole they enjoy a level of deference and public trust that people in most other fields can only envy.
READ THE REST:
www.townhall.com/print/print_story.php?sid=186115&loc=/opinion/columns/jeffjacoby/2006/02/13/186115.html
By Jeff Jacoby
Feb 13, 2006
I don't usually follow nutrition stories, but it was hard to miss last week's shocker about low-fat diets. Like many papers, The Boston Globe put it on Page 1, high above the fold: "Study finds no major benefits of low-fat diet." The study, a project of the National Institutes of Health, had taken eight years, cost $415 million, and involved nearly 49,000 older women, 40 percent of whom were assigned to a diet that kept their intake of calories from fat significantly below that of the other 60 percent. Researchers had expected to confirm what earlier studies and conventional medical wisdom had long suggested -- that consuming less fat is good for your health.
What they learned instead was that the women who dutifully cut back on fried foods, ice cream, and pizza ended up no better off than the women who ate whatever they wanted. The two groups developed breast cancer, colon cancer, heart attacks, and strokes at the same rates. Millions of Americans have been trying for years to reduce the fat in their diet -- eating bread without butter, salads without dressing, chicken without skin -- and now the largest study of the subject ever conducted says it has all been for naught. You could have had those fries after all.
And so once again we are reminded, as The New York Times sighed in an editorial on Thursday, that "the more we learn about nutrition, the less we seem to know." Does oat bran reduce cholesterol? Can dietary fiber prevent colon cancer? Are high doses of Vitamin E good for your heart? Once, the experts said yes. Then the experts said no. It sometimes seems that for every study that makes a nutritional claim, another study inevitably makes an equal and opposite claim.
Researchers can't even agree on whether eating less fat is the way to lose weight. Some insist that obesity is caused by ingesting too much fat, making a low-fat diet the key to shedding pounds. Others claim that reducing fat leads to overconsumption of carbohydrates -- and that it's carbs, not fat, that make people gain weight. Which theory did the massive new study confirm? Neither. Apparently there is still no clear-cut answer -- not even for $415 million.
But clear-cut answers are just what so many Americans want, and what so many of them think science ought to be able to provide. There is a seemingly inexhaustible willingness to believe that the voice of science is the voice of truth -- impartial, incorruptible, and unambiguous. It isn't, of course. Scientists are no less vulnerable to error or bias or ego than the rest of the human race. Scientists too can blunder or act from ulterior motives or convince themselves of things that aren't so. And yet on the whole they enjoy a level of deference and public trust that people in most other fields can only envy.
READ THE REST:
www.townhall.com/print/print_story.php?sid=186115&loc=/opinion/columns/jeffjacoby/2006/02/13/186115.html