The most common and most likely answer to this crossword clue is the 6 plus 8 letter word WEIGHT WATCHERS
I've seen this crossword clue in The Times
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Buddy explains!
The straight part
We know that "Health-conscious folk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case health-conscious folk = weight watchers.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WEIGHT WATCHERS mean?
WEIGHT WATCHERS noun- A person who monitors their body weight, especially when wanting to slim.