[bsder]

I seem to remember that it was also a switch to a different citrus fruit which had way less vitamin C in it so the processing was much mroe important.

However, since the switch corresponded to the rise of steam power (ship trips were much faster), nobody noticed that that they weren't protected from scurvy anymore.

It wasn't until the artic expeditions that scurvy protection got tested again.

[xaedes]

They believed the scurvy protection came from the sourness of lemons, so they switched to lime which is even more sour than lemon, but contains less vitamin C.