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CNN: Can a DNA analysis help improve your fitness?

February 6, 2024 — 

Another concern among researchers is the scientific validity behind these tests. While the accuracy in terms of the actual genetic testing is likely good, the science behind how the companies are interpreting the results can be problematic, said Dr. Dylan MacKay, assistant professor of nutrition and chronic disease at the University of Manitoba in Winnipeg, Canada.

“A lot of times these tests are based on associations, not randomized, controlled trials looking for causal effect,” MacKay said. “For example, watermelon consumption is associated with drowning — because more people swim in the same season as they eat watermelons. But that’s just an association.”

The advice companies give based on your test results is often vague or standard, too. Caulfield’s results indicated he was at risk for certain cardiovascular problems and cancers.

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