This study below that I gleaned from the LA Times shows that just altering your diet may not be able to undo a life of bad eating. Maybe if they included exercise in these peoples lives it may have made a bigger difference to their health.
Overturning three decades of conventional wisdom, a new study of low-fat diets in nearly 50,000 healthy older women has shown that reducing fat intake alone does not significantly reduce the risk of heart disease, stroke, breast cancer or colorectal cancer, researchers reported today. Results from the same study reported last month also showed that reducing fats without reducing calories does not lead to significant weight loss.
“Just switching to low-fat foods is not likely to yield much health benefit in most women,” said Marcia Stefanick, a professor of medicine at the Stanford Prevention Research Center, chairwoman of the steering committee for the Women’s Health Initiative study.
“Rather than trying to eat ‘low-fat,’ women should focus on reducing saturated fats and trans fats,” the so-called bad fats, while maintaining their intake of “good” fats, such as vegetable, olive and fish oils.
“Nutrition knowledge has progressed dramatically since the study began,” said Mara Vitolins, a professor of public health sciences at Wake Forest University Baptist Medical Center in Winston-Salem, N.C., and a study co-author. “Today we know that reducing total fat may not be enough — we need to focus on the types of fat we eat.”
The 13-year study, whose results will be reported Wednesday in three papers in the Journal of the American Medical Assn., did hint at some possible benefits from reducing fat intake. Women on the low-fat diet who had the highest consumption of fats at the beginning of the study showed the biggest decrease in breast cancer risk. And those who achieved the lowest rate of fat consumption showed the lowest risk of heart disease. And those who reduced fat intake had a lower incidence of polyps, generally considered to be a precursor of colorectal cancer.