re: Just diagnosed with Type 2 Diabetes

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What do you get after the randomization protocol is completed? An observational study. What do you get after randomization and people decide they don't like the group they were assigned to? A lot of bias via non-compliance, drop out, or other issues.

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You get a randomized study. It is not observational because you have some control of the independent variable.

Compliance rate is a hugely important factor in the success of any diet, probably the most important. You shouldn’t ignore that data. A study of just the compliant patients would also provide interesting data but introduces major bias.