Quote:
Originally Posted by dogzilla
Obesity, smoking, drugs, alcohol, etc. Basically choices that you made that are generally recognized as having a high correlation to health problems and where the health problems are preventable if you did not make those choices.
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The issue is, of course, that while those cause certain diseases, it is impossible to know if they were specific culprit for any single case. We simply don't know the specific threshold where these things cause the diseases.
Having a BMI over 25 or 30 can lead to a higher chance of heart attacks, but we simply don't know whether that specific heart attack was caused by obesity, genetics, stress, etc.
So unless you eliminate everyone who ever did something unhealthy, you have no way of doing this. Being sunburned as a kid increases the risk for skin cancer, but whether or not skin cancer was caused specifically by that time someone got sunburned as a kid is impossible to tell.