Critical Reasoning (CR) | Researchers have recently come across a phenomenon that they have name

Researchers have recently come across a phenomenon that they have named “the obesity paradox”. The body mass index (BMI) is used as a statistical measurement to estimate healthy body weight and a high BMI is linked with multiple cardiovascular diseases. However, research data indicate that overweight people with a high BMI, compared to people with a normal BMI, have the lowest risk of cardiovascular mortality.

Which of the following, if true, most helps to explain the paradoxical findings
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