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If you assume a 1000 milligram RDA for the 19 to 50 year age group based on table 1
1000 mg / ( 18 mg per 100 grams of beef ) = approximately 5555 grams of beef
About 5 or 6 kilograms of beef per day
https://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/
