Narrated Abu Mas`ud Al-Ansari (RA): The Prophet (ﷺ) said,
"When a Muslim spends something on his family intending to receive Allah's reward it is regarded as Sadaqa for him."
(Sahih al-Bukhari 5351, Book 69, Hadith 1)
Abu Hurairah رض narrates:
“The Prophet ﷺ was asked: ‘What most admits people to Paradise?’ He said: ‘Piety and good manners.’
And he was asked: ‘What most leads people to Hell?’ He said: ‘The two hollow ones: the mouth and the private part.’”
(Ibn Mājah 4246. Sahīh)
The correct answer is a third! One third for air, one third for water and one third for food. It's important to not overeat and allow your body to digest food and carry out its normal processes.