Re: Innuit death rates
A very small study of nearly 200 20th century headstones in graveyards in Nanortalik, South Greenland was carried out by members of the Lichenometry Fire (group) of BSES South Greenland 1992 expedition.
This found average life expectancy of 48 years for males and 62 years for females, although this was skewed by infant mortality twice as high in females as males. Many deaths, particularly males, were caused by fishing / boating accidents, indicated by deaths occuring on the same day, and higher numbers of deaths in light months than dark months (Dec & Jan). So, from this small study, it is difficult to infer that innuit diet protected against disease.
Report published as "Demongraphic information from graveyards in Nanotalik, south Greenland", by Basil Davis, pages 152 - 154, in British Schools Exploring Society report 1992 - 1993, ISBN 0521-1573.