Largest US twin study probes whether nature or nurture makes us sick

"In a new Nature Genetics paper, scientists used an Aetna insurance database of 45 million people, including 56,000 pairs of twins, to study whether genes or the environment matters more for staying healthy. Though the answer isn’t definitive or exact — it varies according to each of the 560 diseases that were studied — the technique holds promise for bringing more insights in the future."


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