人是铁饭是钢 (人是鐵飯是鋼) rén shì tiě fàn shì gāng

rén shì tiě fàn shì gāng phrase one can't function properly on an empty stomach; an empty sack cannot stand upright
Domain: Proverb 谚语
Notes: (CC-CEDICT '人是鐵飯是鋼')