{"id": "card_ref_rda_calcium", "kind": "reference", "title": "Calcium — recommended daily allowance", "body": "Calcium — recommended dietary allowance by life stage: child 9–13 1300 mg/day, adolescent 14–18 1300 mg/day, adult 19–50 1000 mg/day, adult male 51–70 1000 mg/day, adult female 51–70 1200 mg/day, adult 71+ 1200 mg/day. Verified nutrition reference.", "source": {"label": "Verified reference — nutrition", "url": "", "domain": "nutrition", "authority_tier": "reference"}, "shelf": "nutrition", "box": "reference", "bands": ["reference", "nutrition", "RDA", "calcium"], "connections": [{"to_card_id": "card_k_spine_nutrition", "relationship": "member_of", "evidence": "a nutrient the body needs"}, {"to_card_id": "card_works_nutrition", "relationship": "demonstrates", "evidence": "A worked demonstration in the same field (nutrition)."}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "presentation": {"glyph": "•", "kind_label": "reference", "by": "Verified reference — nutrition", "authority": "reference", "posted": "", "standing": ""}, "neighbors": [{"id": "card_k_spine_nutrition", "title": "Nutrition — what the body is given to need", "relationship": "on the shelf of", "why": "a nutrient the body needs", "href": "/card/card_k_spine_nutrition", "resolved": true}, {"id": "card_works_nutrition", "title": "Calories from macronutrients, and a BMI", "relationship": "demonstrates", "why": "A worked demonstration in the same field (nutrition).", "href": "/card/card_works_nutrition", "resolved": true}]}