I don;t think "sacrifice" is the word used in this context. After Gaya Srardham, you are to leave/renounce using/consuming a fruit,a leaf and a vegetable that you like. Not some things you do not consume. For example if I hate bittergourd:Pavakkai' I should not consider leaving its usage.
This makes you mentally prepared for renunciation and control of your desires.
You are NOT supposed to consume the three things you renounced in GAYA again.
This is my understanding on this matter.

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