Hello and welcome, Michael.
The first step is to ascertain the cause of vitamin B 12 deficiency. Second step is to improve the diet and recommendations are to eat; food that contains vitamin B-12;
c) cheese, and
In most patients with vitamin B-12–associated issue if present like neuropathy/myelopathy, no restriction on physical activity is necessary. Thus you can continue playing basketball with the measures we discussed in the last thread. If the deficiency is mild, oral supplementation can be done. Otherwise injectable Vitamin B 12 would be given.
To ascertain the cause following investigations are recommended, if not yet done;
1) Antiparietal cell antibodies; IF antibodies.
2) If antibodies are negative, obtain a serum gastrin level to test for achlorhydria,
3) Schilling test
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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