The case against carbohydrates gets stronger

The L.A. Times reports on a new study by David S. Ludwig :

For our clinical trial — one of the largest feeding studies ever conducted — we collaborated with Framingham State University and the company that manages its food service. We recruited 164 students, faculty, staff and community members who agreed to eat only what the study dictated for a full academic year.

We started the participants on a calorie-restricted diet until they lost 10%-14% of their body weight. After that, we randomly assigned them to eat exclusively one of three diets, containing either 20%, 40% or 60% carbohydrates.

For the next five months, we made sure they didn’t gain or lose any more weight, adjusting how much food they received, but keeping the ratio of carbohydrates constant. By doing so, we could directly measure how their metabolism responded to these differing levels of carbohydrate consumption.

Participants in the low (20%) carbohydrate group burned on average about 250 calories a day more than those in the high (60%) carbohydrate group, just as predicted by the carbohydrate-insulin model. Without intervention (that is, if we hadn’t adjusted the amount of food to prevent weight change), that difference would produce substantial weight loss — about 20 pounds after a few years. If a low-carbohydrate diet also curbs hunger and food intake (as other studies suggest it can), the effect could be even greater.

This result could explain in part why U.S. obesity rates have been going up for decades. Individuals have a sort genetically predetermined weight  —  lighter for some, heavier for others. Despite this, the average weight for American men has gone from about 165 pounds in the 1960s to 195 pounds today. Women, likewise, have gone from an average of 140 pounds to about 165.

An article well worth your time.