[mb_72]

From the article: "It often takes many months for high Vitamin D levels to drop, and it took six months for Shannon’s level to fall into the 50s."

I don't think a journal will help in these circumstances, the time lapse between cause and effect is just too long. Getting tested is cheap and easy (and here I'm thinking of people who are deficient in vitamin D, if the results are too low then it seems that taking a supplement would be a good idea).

[DoreenMichele]

This story in specific is being told by the medical specialist who resolved the issue and I was not really trying to give advice for extreme cases where you should pretty obviously be speaking to a medical specialist.

But I've journaled for years and my experience suggests that if you do it regularly, you do get better at noticing things over longer time frames. So, no, it's not useless to journal in such cases.

As with anything, more education and experience with it will get you better at it and how useful it is to you will depend on a lot of factors.