Cheated and the weight's back on - diet's been broken (7)

I believe the answer is:

twisted

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'broken' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for twisted that I've seen before include "Wound or wrapped around" , "Contorted" , "Coiled; distorted" , "Bent, distorted" , "Turned round" .)

I've seen this clue in the Evening Standard.

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