Increased BDNF leads to neurogenesis. Neurogenesis can alleviate depression by allowing brain regions to grow that have previously shrunk due to depression. Additionally, new nerve connections can form during neurogenesis.
Coffee fruit, meaning raw coffee berries, can more than double BDNF production in small quantities for a period of approximately 2 hours. Perhaps it would be a good idea to buy coffee plants with berries? Otherwise, they are also healthy provided you don't consume too much of them.
It is still quite difficult to obtain unprocessed coffee berries. Coffee plants and coffee berry tea (Cascara) are available, however. So, do you have neurodegenerative disease(s)? You have to put in some effort to secure this BDNF booster (nerve-repairing hormone). Other options are described in the article mentioned above.