Might it go over well if you suggest to him that he go for a checkup? It's quite possible that he is depressed, but it is also possible that the issues are being caused by a physical issue (e.g. electrolyte imbalances, infection, poor nutrition, anemia, or hypothyroidism). You may need to have someone accompany him to the appointment - if he truly is developing dementia or something, he may not be a reliable historian. (Often people with dementia forget that they forgot something or got lost for example. Their insight is often very poor and it makes them unreliable historians.)
If your dad is determine to have full capacity, he does have the right to live at risk. That's his choice.
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