I would think that it's their noses, not their nose.
Is there anything that bothers you about this sentence? I might put a period after weakened and end it this way: As a result, food tastes bland. I'm not sure that direct is necessary. And I like shorter sentences.
Later in the article, there's another sentence that bothers me:
"... they will have a greater risk of bone fractures for the rest of their life."
Again, I would make it their lives, not their life.
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