It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him), when he wanted to eat while in a state of major ritual impurity (janabah), would perform ablution (wudu) like that for prayer.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20011