grid deduction - Double feature: Health shakes

_{This puzzle is part 10 of the Double feature series (first part here). The series will continue in "Double feature: Computer problems".}

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Rules of Slitherlink¹

• Draw a single continuous loop in the grid, following cell borders.



• The loop never branches off in multiple directions or crosses itself.


• The numbers indicate how many lines belonging to the loop surround that cell. If no number is indicated, the cell may be surrounded by any number of lines.

Across
2. Red camp ground lacking space (7)
5. Surge of water is eventually concealed (4)
7. Following a drain without delay (4)
8. In Spain, the primary official language (3)
9. Irish author's delight: finishing parts of Celtic tale (5)
13. Brew a lime peel (3)

14. A feline male chromosome (4)
15. Water of the first degree (5)

Down
1. A gel spread almost too smoothly (6)
2. Leading lawyer follows California gangster's right-hand man… (4)
3. …as well as Capone's organization's head (4)
4. Hearing to take note of Mr. Chagall (4)
6. Father of 007 in a cast (3)
9. Giants share their home with black bears, at last (4)
10. Some mystery, enigmatic note from Tokyo (3)

11. Make an impression in ketchup (4)
12. Apple computer's physical address (3)
13. Dismiss a gender-neutral pronoun (3)

_{¹ Paraphrased from the original rules on Nikoli.}

Solve both puzzles to answer the question: What are health shakes?

Answer

Health shakes are

MEAL REPLACEMENTS

Solved cryptic crossword (with explanations) + Slitherlink:

Across
2. Red camp ground lacking space (7) = (RED CAMP)*
5. Surge of water is eventually concealed (4) = _RISE_
7. Following a drain without delay (4) = A + SAP
8. In Spain, the primary official language (3) = LA + O_
9. Irish author's delight: finishing parts of Celtic tale (5) = JOY + _C + _E

13. Brew a lime peel (3) = A + L_E
14. A feline male chromosome (4) = MAN + X
15. Water - of the first degree (5) = TONIC (ddef)

Down
1. A gel spread almost too smoothly (6) = (A GEL)* + TO_
2. Leading lawyer follows California gangster's right-hand man… (4) = CA + _R + L_
3. …as well as Capone's organization's head (4) = ALS + O_
4. Hearing to take note of Mr. Chagall (4) = MARC (homophone of MARK)
6. Father of 007 in a cast (3) = (IN A)*
9. Giants share their home with black bears, at last (4) = JET + _S
10. Some mystery, enigmatic note from Tokyo (3) = _YEN_

11. Make an impression in ketchup (4) = _ETCH_
12. Apple computer's - physical address (3) = MAC (ddef)
13. Dismiss a gender-neutral pronoun (3) = A + XE

To extract the phrase,

overlap the Slitherlink path on the crossword grid, then take all the letters not inside the loop, excluding the ones outside the 9x9 grid, and read from left to right, top to bottom: