Hmmm … I’ve read this piece and the associated BMJ report and, whilst the benefits may be “staggering” and show a correlation, the statistics and report fight shy of attributing causality to cycling.
The cyclists that I know are already quite fit, watch what they eat, and don’t carry much, if any, excess weight. If survey samples were made up of similar people, then they are probably already leading a lifestyle that takes them out of high-risk groups for CVD, cancer etc. – regardless of their cycling to work.
A correlation cross-mapping exercise might resolve the causality issue, but that’s for another study maybe…