Thank you for submitting your query.
Brain Atrophy is known as cerebral atrophy
in medical parlance and Low Vitamin B12
is coupled with Brain Atrophy and Cognitive Impairment
I would recommend you to get yourself examined by a qualified neurologist
and get your serum Vitamin B12 levels tested. If it is low, you need to be started on Vitamin B 12 capsules and supplements as directed by your doctor. Just follow your doctor's prescription orders, stick to your treatment plan and go for regular follow up.
if you do and drink alcohol in moderation.
Hope I have answered yo query.
Wish you Good Health, Take Care.