Thanks for the link Dagney, it was an interesting read.

One note:

The couple, who are diabetic, tested their blood-sugar a few times a day. Their readings had never been so good.

I guess this was due to not having any food to eat that would normally elevate their blood-sugar?
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock