Hisham bin Urwah (may Allah have mercy on him) narrated from Sayyidah Aishah (may Allah be pleased with her): My mother tried to treat me so that I would put on some weight, in order to send me to the Messenger of Allah (peace and blessings be upon him). Nothing worked for me until I began eating dates with cucumber, and then I put on weight very well.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14469