Are both of these sentences grammatically correct?
a) I’m worried for your father’s heath. I wish he didn’t eat so much.
b) I’m worried for your father’s heath. I’d like him not to eat so much.
Thank you!
health - I think your version might be a typo 
Both phrases are okay.
Ooops, a romantic typo. Is there any difference in meaning between “would like” and “wish”? Cheers!
‘wish’ is possibly a stronger emotion, but ultimately the difference is slight.
Can we use " worried for" and “worried about” interchangeably specifically in the above sentences?
Yes. ‘Worried about’ is the most common expression of the two.
In practical usage, there is very little difference. Possibly:
worried for - places the focus on the health.
worried about - places the focus on the person.
I see. Thanks a lot