• “Ut quod ali cibus est aliis fuat acre venenum.” – Titus Lucretius Carus (c. 99 – 55 BC), Roman poet and philosopher. On the Nature of Things.

  • What is food to one, is to others bitter poison.

    • Book IV, line 637; comparable to: "What's one man's poison, signor, / Is another's meat or drink", Beaumont and Flectcher, Love's Cure (c. 1612–13; revised c. 1625; printed 1647), Act iii, Scene 2.

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By the early 17th century the expression is clearly well in use as Jacobean playwright Thomas Middleton writes "Whereby that old moth-eaten proverb is verified, which says, 'one mans meate, is another man's poyson'" (1604).

 

Hector Urquhart's introduction to 1860s Popular Tales of the West Highlands: "One man's rubbish may be another's treasure."

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http://english.stackexchange.com/questions/60429/origin-of-one-mans-trash-is-another-mans-treasure

https://www.bloomsbury-international.com/en/student-ezone/idiom-of-the-week/list-of-itioms/1358-one-mans-meat-is-another-mans-poison.html

https://www.bookbrowse.com/expressions/detail/index.cfm/expression_number/442/one-mans-meat-is-another-mans-poison