Why did medical interventions SHORTEN life span?

They did a 40 - 80 year research study in a European country years ago

They took 500+ CEOs who had underlying health problems like obesity or cardiovascular disease and divided them into two groups

One group was not given any interventions

The second group was given fitness advice and dieting advice and medications and therapy to manage their health

In the end the group that received the intervention died faster than the group that did not
Why did medical interventions SHORTEN life span?
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