Calcium
#1
Gambian people eat from 195mg to 340mg of calcium per day and have less fracture than people from France that eat an average amount of 800mg of calcium per day:

https://www.ncbi.nlm.nih.gov/pubmed/22333875

https://www.ncbi.nlm.nih.gov/pubmed/8797124

English women have more mineral density but less fracture:

https://www.ncbi.nlm.nih.gov/pubmed/10648270

No genetic differences between the two regarding bone metabolism:

https://www.ncbi.nlm.nih.gov/pubmed/10355494

Risks of calcium supplements?:

https://www.sciencedaily.com/releases/20...084911.htm
http://www.mayoclinic.org/diseases-condi...n-20024829

Osteoporosis and milk? https://saveourbones.com/osteoporosis-milk-myth/

I've noticed that everytime I up my vitamin D intake to more than 1000UI a day I get very bad tooth pain.
#2
It's the calcium to phosphate ratio that matters. Do you have the data on phosphate consumption? In theory a person with very low grain or seed consumption, who eats fruit instead, would need far less calcium. Also, if they eat less meat they need less calcium. An important data point for any analysis is PTH. TSH and Prolactin would also be important. https://chrismasterjohnphd.com/2016/05/1...balancing/
  


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