July 2010 The McDougall Newsletter www.drmcdougall.com Page 1
Fat or Carbs: Which is Worse?
Dr. Andrew Weil‟s article in the Huffington Post has led his readers to believe that
saturated fats in the diet, which are primarily from meats and dairy products, are better for them to eat than carbohydrates, which are from plant foods. He bases this on
a March 2010 analysis that was “published in the American Journal of Clinical Nutrition (that) found that „saturated fat was not associated with an increased risk‟ of
coronary heart disease, stroke or coronary vascular disease.” In his opinion this piece
of research is a significant exoneration of the dietary saturated fat theory for the cause of heart disease. He failed to mention that the National Dairy Council funded this study.
Furthermore, the formulation of Dr. Weil‟s revolutionary opinion on the wisdom of eating a diet high in
animal foods appears to have been uninfluenced by an accompanying editorial written by the legendary
authority on diet and heart disease, Jeremiah Stamler, MD. Dr. Stamler debunked this dairy-industry
funded study based on its flawed methodology, and a disregard of 50 years of diet-heart research with
contrary findings, and dozens of metabolic (ward-type-feeding) experiments showing that eating saturated fat and/or cholesterol causes an adverse effect on blood lipids. In addition, thousands of relevant
animal studies on the damaging effects of saturated fat and cholesterol were ignored.
In this Huffington Post article, Dr. Weil claims carbohydrates are the real culprits, and he bases this in
part on an April 2010 article from the Journal of the American Medical Association. This population study
found that increasing added dietary sugars from less than 5% to more than 25% of the calories (a fivefold or more change) caused a small increase in triglycerides (by 9 points, from 105 mg/dL to 114
mg/dL), with a similar small reduction in good cholesterol (HDL-C) (11 points, from 58.7 to 47.7 mg/dL).
Most important to notice is the large amounts of “unhealthy” carbohydrates (table sugar) that must be
consumed for even small changes in blood lipids to be noticed.
In highly-controlled experiments, in order to show a rise in triglycerides, the experimental design has to
be based on feeding the subjects large amounts of refined sugars and flours, and/or the subjects in the
experiments are required to eat more food than they can comfortably consume; in other words, they are
forced to overeat. Confirmation of the healthfulness of carbohydrates is seen when people are fed
starches, such as whole grains, beans, and potatoes, and green and yellow vegetables, rather than overfed sugars and flours; their triglyceride levels do not increase.
Dr. Weil‟s position runs contrary to several irrefutable observations that you can make for yourself.
Starches have fueled the engines of human civilizations for at least the past 14,000 years. Carbohydrates
(starches), such as rice in Asia, corn in Central America, potatoes in South America, and barley and
wheat in Europe, have provided the bulk of the calories for almost all human diets. Only a few small
primitive populations, living at the extremes of the environment, such as the Inuit (Eskimos), have been
fueled by saturated fats. Just as undeniable, worldwide today, populations of people who consume the
greatest amounts of carbohydrate are the trimmest and fittest, and also have the lowest incidence of
heart disease and diabetes. This truth is confirmed by observing the change that occurs when people
from Japan, for example, migrate to the United States or Europe. As they eat less rice (carbohydrate)
and more saturated fat (meat and dairy products) they become fatter and sicker.
Pointing the guilty finger away from fat and towards carbohydrates is self-serving for those diet-experts
who themselves refuse to give up their high-fat diet. Food industries buy scientific research published in
respectable journals because it is one of their most effective marketing tools. The end result of this mixing up of the truth could be that billions of people will be deprived of a real opportunity to live long, disease-free lives.
John McDougall, MD