<human>: Can you succinctly summarize the text in 1-3 sentences?

So my dad is wasting a away due to malnutrition.  Here's the thing though...we have plenty of food, he just won't eat.

Some backstory: About 7 years ago my dad nearly died from an acute double pneumonia that fully affected both lungs.  It progressed to ARDS:

He lived, but there was obvious physical damage as ARDS can be a really rough illness.  It's especially rough, recovery wise (however he did retain most lung function).  For the past 7 years or so (my dad is 65) he has gotten progressively worse.  I offer him small amounts of food and he says "too much".  He will be up for 4-5 hours and not eat.  On top of not eating however, he refuses to exercise and has become agoraphobic.  He won't even lift 5lb weights, and quite honestly without at least some significant exercise I don't think it will matter how much he eats because he's lost so much muscle mass.

My mom works full time and has been trying to do her best to pester him but her solution is just "feed him whatever he'll eat".  But she doesn't have the time to cook for him 24/7 and often times the things he eats are devoid of the real nutrients he needs.  He generally refuses to feed himself, or if he does it'll be small amounts of processed simple carbs.

I work at a local health food store.  I have easy access to the healthiest food available to consumers, and large amounts of it (at a discount).  It's not a matter of not being ABLE to make it happen, it's a matter of him not doing it.  He's 5'10" and weighs probably 110lbs right now and gets skinnier daily.  He's wasting away.
<bot>: My dad is slowly killing himself by not eating or exercising and I'm not sure if there's anything me or my family can do to save him.