96yr old dad with Lewey Body Dementia doesn't want to eat! What to do?

I'm Dad's full-time 24/7 caregiver (I'm living temp with him in his home). He will be 96 in a few weeks. Pretty healthy otherwise for a 96yr old but has moderate & worsening lewey body dementia. I can see him decline almost weekly. There's soooo much going on here, but my main issue these days with him is that he's loosing his appetite. I battle with him more and more to get him to eat. He's eating breakfast well but the rest of the day is a battle. If I force the issue and make his meal and place it for him to eat he'll say ok and 1/2 later I'll check on him and he's shoved his napkins in the food. Oh Dear God - what to do. I'm ready to scream! He's still pretty active, goes outside and tinkers with whatever just to keep busy I guess. Any suggestions! Or should I just relax and let it be? What have you all done when this happens! Thanks in advance!