The renewed interest in the solution of the rickets problem is evidenced by numerous publications dealing with the subject from an experimental as well as from a clinical and social-hygienic standpoint. In the main, these communications have tended to verify the older ideas of the causation and treatment of rickets. The rôle of calcium, phosphates and cod liver oil has again been studied through animal feeding experiments, although little that is fundamentally new has been added to our knowledge. Instead of the old term, "bad hygienic surroundings," we now think more specifically of lack of sunlight.
Not much light has been thrown on the question of the influence of heredity, using this term in a loose sense. While we are not even yet in possession of definite knowledge as to the exact parts played by calcium, phosphorus and possible antirachitic vitamins, we do know that their absence from the diet,
BYFIELD AH, DANIELS AL. THE RÔLE OF PARENTAL NUTRITION IN THE CAUSATION OF RICKETS. JAMA. 1923;81(5):360–362. doi:10.1001/jama.1923.02650050014005
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