He has pica, which has him wanting to eat/chew constantly. I’ve been successful locking up things that could hurt him or contribute to his diabetes. I leave a bowl of healthy snacks out for him. Yet, he asks for food constantly, sometimes while he’s still eating and asks for meals about every 20 minutes during the day; from the time he wakes up until he sleeps. By mid afternoon I get totally frustrated with the constant asking and explaining.
So for example if breakfast is cereal, a fruit, juice, coffee
Give him cereal at 8:30
Give him fruit juice at 9:00
Some fruit at 9:30 or 10
A snack at 10:30 or 11
And start all over with lunch at 11:30 or 12
Break lunch into parts as well and dinner do the same.
If you give smaller portions you can make this an all day buffet!
If possible, does he go to an Adult Day Program? This might keep him occupied and it would be a bit easier on you.
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These things won't add calories or exacerbate DHs diabetes. They won't help you deal with the frustration of general caregiving or answering repeated questions all day long, though. You need respite. Get in home caregivers to give you a break or get DH into a daycare program, or consider placement if you're very burned out. It all gets to be too much after a while, even for a person with the patience of Job.
Best of luck.