It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The stomach is the reservoir of the body, and the veins come to it (to take nourishment). So when the stomach is healthy, the veins return with health, and when the stomach is corrupted, the veins return with sickness."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Zuhri except Zayd bin Abi Unaysah; Ibrahim bin Jurayj al-Ruhawi is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 4343
Hadith Gradingمحدثین:لا يصح، وفيه يحيى بن عبد الله البابلتي ضعيف
Hadith Takhrij«قال الدارقطني: وهم لا يصح «العلل الواردة في الأحاديث النبوية، ج 8، ص 43»» «قال الهيثمي: فيه يحيى بن عبد الله البابلتي وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 5، ص 86»»