Yeah, since it's legal to treat one without a licence :)
Here is my strategy,
Try to convince the community to eat vegetables in every meal. They should at least have salad placed next to their meal. After each meal, tell them that they should consume fruit such as banana. And if they feel hungry, just tell them to eat fruits.
Hope this helps
If I was the nurse I would say
“ your primary healthcare provider has most likely asked you to stop drinking because while it might not have caused a problem yet the effect of drinking 4 glasses of whiskey a day for 20+ years add up over time and could cause serious health issues in the future”
I think all of the above, i hope that helps! :))