re: Just diagnosed with Type 2 Diabetes

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Not randomized which introduces huge bias.

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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.

Achieving valid randomization in human studies, outside of the lab, is very difficult, if not impossible.

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But you’re right, you can’t guarantee equal weight loss in a study. But you can design it with that goal in mind.

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You don't want to try and control the outcome values, you want to introduce an intervention and then see where the DV lands. If you try to control the DV in some way, that would introduce bias.

If you're talking about trying to make two diets iso-caloric, then see if there are differences, I understand what you mean.

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To be clear, I am not saying that a low carb diet is not a good strategy to treat diabetes. What I’m saying that it’s not the ONLY good strategy

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I agree.