In fact, this proverb first came from the book "De Rerum Natura" (On the Nature of Things) by the ancient Roman poet and philosopher Lucretius (Titus Lucretius Carus, 99BC - 55 BC): "Ut quod

ali cibus est aliis fuat acre venenum", which means "What is food to one, is to others bitter poison" (My delicious food, your poison).