Abu Hurayrah narrates that there was a man who used to eat a lot of food. He then accepted Islam, and he began to consume less. That was mentioned to the Prophet (saws), and he said: 'The believer eats with one stomach, while the disbeliever eats with seven.' [Authentic: Narrated by al-Bukhari (5397)]

Ibn ‘Umar narrates that the Prophet (saws) said: 'The disbeliever eats with seven stomachs, while the believer eats with one.' [Agreed upon: Narrated by al-Bukhari (5394), and Muslim (2060) in this wording] In the wording of al-Bukhari: 'The disbeliever (or: 'the hypocrite' - the narrator was unsure which one ‘Ubaydullah siad) eats with seven.'

Abu Hurayrah narrates: The Messenger of Allah (saws) said: 'The Muslim eats with one stomach, while the disbeliever eats with seven.' [Authentic: Narrated by Mâlik in Sifat un-Nabiy (saws) (9), and al-Bukhari (5396)]

Abu Hurayrah narrates that the Messenger of Allah (saws) was visited by a guest who was a disbeliever. The Messenger of Allah (saws) instructed that a sheep be milked for him. He drank its milk, and then drank another, and then another until he drank the milk of seven sheep. He later accepted Islam, and the Messenger of Allah (saws) instructed that a sheep be milked for him. He drank its milk, and when another was ordered to be milked, he did not finish it. The Messenger of Allah (saws) said: 'The believer drinks with one stomach, while the disbeliever drinks with seven.' [Authentic: Narrated by Mâlik in Sifat un-Nabiy (saws) (10), and al-Bukhari (2063)]