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Harvard Health Letter

What is normal?

Published: November, 2008

The shifting boundaries of normal and healthy cholesterol levels, blood pressure, and other health indicators.

It seems that the definitions of normal, healthy levels of blood pressure, cholesterol, and other health indicators keep changing, so that increasing numbers of people are classified as being at risk and therefore in need of treatment. Yesterday's normal becomes today's needs-to-be-treated.

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What is normal?

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