The most common and most likely answer to this crossword clue is the 7 letter word DIETARY
I've seen this crossword clue in Independent
D
I
E
T
A
R
Y
More clues leading to the result DIETARY
- Journal containing enigmatic thoughts initially, referring to everything taken down
- Looking at regular intake, conclusions of the provost scheduled, it’s suggested?
- I eat dry crackers, given this advice?
- Journal contains time after note about what one eats
- New idea – try relating to recommended food?
- Alien in journal is interested in food
- As food allowance is out of this world, recorded in log
- Alien contributed to Journal of Nutrition
- Excellent nutritionist finally going through log of what you eat
- Ready with it, prepared type of fibre
Buddy explains!

The straight part
We know that "this advice" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this advice = dietary.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 DIETARY mean?
DIETARY noun- A regulated diet.
- Of, or relating to diet.
- Comprising a food source.