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Question: Could low-normal phosphorus be from my calcium intake?
Given that your calcium is coming from milk and yogurt and Traditional Foods Market brand whole bone meal to get your calcium, you're definitely consuming plenty of phosphorus, and so I don't think your dietary phosphorus is off. I wouldn't really worry about the phosphorus being low in that range. It's not low, it's on the low end of the range. I think the PTH being suppressed to 18 is great. I think the calcium doing that is great. I think that the calcium did that, even when all your calcium sources were balanced by phosphorus, sounds really good because phosphorus would do the opposite.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.