The Eskimo Diet is unnatural, and tends to produce osetoporosis.
A very-high protein diet is excessively acid-forming systemically. The body must buffer the blood moment to moment within a very narrow pH range. Leeching the calcium from the bones is the way it keeps the blood livable when it is continually subjected to the acidic by-products of an acid-forming diet.
It is also hard on the kidneys and liver.
The human body is adaptive, but not all adaptations are without negative consequences.
A ketogenic diet is not high protein.
https://www.ncbi.nlm.nih.gov/pubmed/28561302
Abstract North American Inuit and Inupiat ("Eskimo") populations have been described as having a lower bone mass relative to Caucasians as a consequence of their traditional high-protein "acid-ash" diet. However, this bone buffering mechanism has also been implicated as a risk factor for osteoporosis in industrialized Caucasian populations, and one recent study has found a positive association between dietary protein, and bone mass in premenopausal women. The original studies documenting the Eskimo-Caucasian difference in aging bone loss do not consider the consequences of population variation in body composition, in particular lean body mass (LBM), which correlates with bone mass. The possibility also exists that the original reference sample may be exceptional rather than normative for bone mineral density (BMD). Regression analysis was conducted on published age- and sex-specific cohort means for BMD, and bone mineral content adjusted for estimates of LBM for the original Eskimo-Caucasian comparisons, and for an additional Caucasian sample from Belgium. Significant differences were found between all groups, including Belgians, and the Wisconsin sample for BMD, supporting the notion of the latter having exceptional bone quality when measured as BMD. When adjusted for LBM, the Eskimo samples are distinct in pattern and magnitude of aging bone loss relative to Caucasians, supporting the hypothesis of real inter-population differences. However, given the current ambiguity surrounding the "protein-calcium buffering" model, an alternative explanation is offered. It is hypothesized that the accelerated bone loss among the Inuit and Inupiat reflects higher production and utilization of the thyroid hormones, T4 and T3 , as a mechanism of cold adaptation through enhanced nonshivering thermogenesis. Am. J. Hum. Biol. 9:329-341, 1997.