Adding the clinical framing, because it changes how the question reads. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.
If somebody has the primary source to hand I would rather cite it than paraphrase it.
Dr.NutriCornell said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
This matches mine closely enough to be worth saying so out loud.
Dr.NutriCornell said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
Coming at Dr.NutriCornell’s question from a different direction. It helps to say which part of this you are uncertain about. A precise question gets a precise answer; a general one gets everybody’s favourite anecdote.
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Browse GL BiochemOne concrete data point for the thread. Worth stating the units and the reference range whenever you post a number here. A large fraction of the apparent disagreement in these threads is two people using different units and both being right.
One thing that is still open after Dr.NutriCornell’s answer:
What did you change at the same time, and can you separate the two now?