Hutan
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From The Washington Post article:
That sounds impressive - 80% of 612 metabolites. Unfortunately I think it isn't correct.
From the Naviaux paper abstract:
From the Naviaux paper:
There were statistically significant abnormalities of any kind (high or low) in only 20 of 63 pathways. So lots of the metabolites tested showed no significant variance between patients and controls.
The paper could have been clearer about this. The Washington Post statement immediately struck me as wrong, but it has taken me quite a while to put together this weak refutation.
Naviaux looked at 612 different metabolites, which are intermediate substances such as glucose produced by cells as they break down larger molecules and produce energy. They found that 80 percent of the metabolites were lower in those with CFS. They also found what they described as “abnormalities” in 20 of the metabolic pathways.
That sounds impressive - 80% of 612 metabolites. Unfortunately I think it isn't correct.
From the Naviaux paper abstract:
We targeted 612 metabolites in plasma from 63 biochemical pathways by hydrophilic interaction liquid chromatography, electrospray ionization, and tandem mass spectrometry in a single-injection method. Patients with CFS showed abnormalities in 20 metabolic pathways. Eighty percent of the diagnostic metabolites were decreased, consistent with a hypometabolic syndrome.
From the Naviaux paper:
Twenty-one of the top 25 (84%) discriminating metabolites were low. These findings were consistent with the notion that CFS is a coordinated hypometabolic state.
...
Females. Thirteen metabolites were selected as a diagnostic classifier in females as described above.
There were statistically significant abnormalities of any kind (high or low) in only 20 of 63 pathways. So lots of the metabolites tested showed no significant variance between patients and controls.
The paper could have been clearer about this. The Washington Post statement immediately struck me as wrong, but it has taken me quite a while to put together this weak refutation.
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