[dopidop]

Your source do talk about the introduction of tinned and canned meat.

I haven’t find ratio or quantity. But furthermore I find this bit problematic in the context of this conversation.

“ This period was, nutritionally speaking, an island in time; one that was created and subsequently squandered by economic and political forces”

In the light of this last paragraph, it seems incorrect to use this source to qualify the diet or the ( nebulous ) “past”. It seems to apply only for the Victorian era.