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Please consult with his doctor to see what they feel is happening.
I recalled, reading this, that my mom unintentionally lost about 10 lbs when she was in her late 80s, right after she had decided to stop driving. Her internist sort of brushed it off at the time and said that it seemed to be a pattern in older folks; his own dad was 100 at the time and the same thing had happened; he'd lost a bunch of weight with no discernable cause.
It certainly should be mentioned to the doctor and a workup done to look for a cause, but apparently in about 25% of the cases, no causal factor is ever discovered.
Prayers for you both.
1st have Dr check Dad out to make sure he gets a clean bill of health.
After Dr visit, start feeding Dad high calorie foods.
Add a can or 2 of a Meal Replacement Drink like Ensure, ect to his daily food intake but the ones with the most calories.
My Dad's Dr said they started feeding his Grandfather Brownies every day.
Old people can't taste like they use to and seems they Iike anything sweet.
He's 90, has cancer, and Alzheimer's. Not eating is normal at the end of life. Force-feeding him is not appropriate whereas pleasure feeding is fine. It may be time to get him a palliative care consult and talk about hospice. Focus on his quality of life for whatever time he has left.
On hospice my husband enjoyed popsicles. This also helped keep him hydrated.
Bring it up with his doctor, for sure.