Spotify has now deleted more than 40 episodes of "The Joe Rogan Experience" from its archives, after the audio streaming giant recently — and quietly — removed two more episodes from its service.

One of the latest episodes deleted, as first reported by Digital Music News on Tuesday, was episode No. 411 with Bulletproof Coffee founder Dave Asprey. The podcast episode initially aired in November 2013 but is now unavailable to Spotify listeners, bringing the total to three episodes featuring Asprey that have been deleted overall.

It's unclear why the episodes have been purged, but as DMN pointed out, "One explanation for the removals is that Asprey frequently backs controversial anti-aging and scientific theories, including claims that Bulletproof Coffee is extremely healthy while other coffee brands are not." The 47-year-old Asprey has also claimed he will live to the age of 180, at minimum, thanks to his unconventional diet and lifestyle approach.