Bad form of nutrition (4,4)

I believe the answer is:

junk food

(Other definitions for junk food that I've seen before include "It tastes good but it's high in calories with little nutritional value" , "Ill-considered diet" , "Burgers and chips etc" , "Unhealthy grub" , "Easily available fare of little nutritional value" .)

I've seen this clue in The Times.

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