I my husband has been diagnosed with major depressive disorder and seems to be much more forgetful than he used to be. I know this could just be because he doesn't have the motivation to be engaged with much, but I'm wondering if it could be something more? Thanks.
You're completely right, it really comes down to loss of attention and/or concentration. The altered levels of neurotransmitters in the brain can actually make it difficult to make new memories. It is also true that with this lack of motivation, individuals can have problems initiating interactions, making decisions or plans and organizing life. That may sound extreme, but under the weight of depression all the aforementioned tasks can feel overwhelming.
I would also ask if he is on any anti-depressant or other medications? I am not a doctor or a pharmacist, but I know that certain drugs can impair cognitive/memory function and would suggest asking a doctor about how likely this is for his particular collection of drugs/herbs (if he is in fact taking any.)
Also, I would make sure that he's eating enough fresh and nutrient dense foods! Our brains and bodies need nutrients to function properly and this could help (especially omega 3s).
Exercise always helps too!