The most common and most likely answer to this crossword clue is the 4 letter word BRAN
I've seen this crossword clue in The Times
B
R
A
N
More clues leading to the result BRAN
- Book featured healthy component of diet
- Mark has day off cereal product
- Only half the local outlets offering healthy food?
- Cereal bargains the regulars picked out
- Cereal prohibition blocked by resistance
- Refuse to disallow capturing rook
- Make incomplete husks
- Shortly make something for breakfast
- Bits of breakfast roughage adding nourishment
- Boycott involving recipe for breakfast cereal
Buddy explains!

The straight part
We know that "healthy food" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case healthy food = bran.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 BRAN mean?
BRAN noun- The broken coat of the seed of wheat, rye, or other cereal grain, separated from the flour or meal by sifting or bolting; the coarse, chaffy part of ground grain.
- The European carrion crow.