HDL Cholesterol linked to disability in MS

Researchers found that people with MS with greater disability (assessed using the physician-reported Expanded Disability Severity Score, EDSS) were more likely to have low HDL blood levels, while those with less disability had higher HDL levels demonstrating a significant association between HDL level and disability.

The article implies that the link is causal in the direction of "higher HDL" => "lower disability", but does not discuss the possiblity that more active, less disabled people might have higher HDL because they are more able to exercise and eat right. Never=the-less, it is something that should be looked at.