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Unexplained and unintentional weight can be a sign of a medical condition that needs attention. You don't say if you are a family member, or an aid/employee in a facility -- but this needs to be brought up to someone who has the legal authority to make medical decisions for this man. I suggest he be seen by his primary doctor (accompanied by someone). This companion will need to be made the man's Medical Representative, which is a HIPAA form he needs to fill out and sign in order for any doctor to communicate his private, protected medical information *legally*.

Examples:

1. Hyperthyroidism
2. Uncontrolled or New-Onset Diabetes
3. Malabsorption Syndromes
4. Cancer (Occult Malignancy)
5. Frontotemporal Dementia (FTD)
6. taking steroids
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Reply to Geaton777
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SamTheManager Jan 13, 2026
I think you're right on about the diabetes. People don't often recognize that a sign could be losing weight quickly while being very hungry all the time.
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Sounds like a good problem to have
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Reply to Daughterof1930
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This is a very good question to ask this 70 year old man's doctor. We can only speculate which causes more anxiety than anything else.

Good luck to you.
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Reply to lealonnie1
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Geaton has a great answer for you about the possibilities.
When you have a question regarding something medical it is best to go to the medical experts, not a Forum of strangers.

Geaton has told you the most common reasons that someone might eat more and not gain any weight, but if you are truly overly concerned about this I would discuss it with your loved one's doctor in the case that you have POA, and simply leave it alone if you are not. I don't quite see the problem here "at present".
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Reply to AlvaDeer
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Get the doctor to do tests don’t guess
it could be nothing or something that needs to be caught early
thyroid/diabetes/cancer amongst some
It could be nothing but if it is something then the sooner it’s caught the easier it is to treat
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Reply to Jenny10
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Is he losing weight? Is he underweight?

Perhaps keep a weight log of his daily weight taken at the same time each day wearing same clothes. Like Furst thing in the morning after bathroom. Do this for a few weeks to better understand what is happening. This might help a doctor in guiding you on any needed action.
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Reply to 97yroldmom
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"Malabsorption is the body's failure to absorb nutrients from food, leading to symptoms like chronic diarrhea, bloating, weight loss."

This is one of the things on Geatons list. I would definitely call the mans doctor and get him in for a physical.
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Reply to JoAnn29
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Has his thyroid been checked for hypothyroidism? It's easy to detect with a THS test. It's often mistaken for other things.
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Reply to Tina1923
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It is very distressing to see this with my husband.
All Geaton said are good points.
My husband was in hospital last year almost every month
. Initially I thought he kept losing weight because of hospital food, but I brought him meals, good snacks and he ate fairly well.
Nevertheless he lost over 20% of weight in six maybe eight months.
In November and early December his appetite returned and he ate more.
But only for a while so did not gain weight.
Back in hospital this year with bad infection again.
Asked several doctors about his weight loss, nothing definitive established.
Some say progression of Parkinson’s, or meds or not absorbing nutrients for some reason.
All they did was give him Boost which he disliked.
I see lots of changes, sweating, constant cough, not drinking, unintentional weight loss, delirium, morphine not helping with pain anymore and so many other symptoms.
If your LO is only eating more for a while perhaps will not gain weight right away, but also look for other symptoms as I do as I can see more changes happening.
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Reply to Evamar
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ShirleyDot Jan 8, 2026
@Evamar - It sounds like your husband's weight loss is related to his fight with PD. The sweating, I'm imagining stiff muscles, coughing - his body is working hard even if he is in bed most of the time. I'm so sorry. PD is a beast.
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I see a lot of the answers here address the lack of weight gain.
It is a good idea to track his weight and keep a food journal, also noting bowel movements, so you have some real information when asking his doctor.

I want to answer the unusual change in his eating habits. You say once picky with food, now wants to eat everything. The reasons for this could be from medication, or an illness, or a sign of cognitive impairment (dementia). Often, people with dementia will eat anything, eat too often, eat only sweets, and even may try to eat things that are not edible, because they don't remember when they ate last, and they don't recognize foods. They may not even eat at all, because they simply forgot how.
I think it's a fairly good problem if he's eating well. But, make the doctor aware of the changes, especially if he is losing weight, as it might be a sign of illness.
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Reply to CaringWifeAZ
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