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Hello and thank you for using JustAnswer. I am very sorry that your mother is having these symptoms and a lack of an appetite, I can understand how distressing this can be to see her in this state. A feeding tube would definitely be a last resort and would be of tremendous discomfort to your mother is she was being forced to eat. If she is not in a severe state of dementia, than most likely she has not forgotten to eat, just does not have an appetite because of the negative symptoms from her Schizophrenia. Negative symptoms are usually an absence of normal function such as no motivation/drive, flat affect, lack of appetite, sleeping all day, etc...Unfortunately there is no great treatment for negative symptoms, but I would recommend that her doctors consider trying her on an appetite stimulant type medication first like Mirtazapine to help encourage her to eat more. Mirtazapine is an antidepressant that is often used to stimulate appetite in the elderly, so this may be effective for your mother. After appetite stimulant medications are considered than the choice of IV nutrition or a feeding tube can be considered, but hopefully the Mirtazapine will be effective for your mother.