A proverb meaning that what is beneficial to one person may be harmful to another; 'one man's meat is another man's poison.'
味の好みは人それぞれだ。甲の薬は乙の毒ということだね。
People's tastes differ. It's a case of 'one man's meat is another man's poison.'
彼にとってはよい薬でも、別の人には合わない。甲の薬は乙の毒だ。
Something that suits him well may not agree with someone else. One man's medicine is another's poison.