It is narrated from Sayyiduna Zayd bin Arqam (may Allah be pleased with him); he said: A man came to the Prophet (peace and blessings be upon him) and said: "You people claim that the people of Paradise will eat and drink?" He (peace and blessings be upon him) said: "Yes, by the One in whose hand is my soul! A man of Paradise will be given the strength of a hundred men in eating, drinking, intercourse and desire." He said: "But whoever eats and drinks also has a need to relieve himself?" He said: "In the form of sweat, and when that happens his stomach will become slender."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4986