Why did not the Companions, especially the wealthy among them like Uthman, take care of feeding the Prophet, peace and blessings be upon him, despite the hadiths that mention his suffering from hunger?

The Prophet (peace and blessings be upon him) was the most ascetic of people regarding worldly matters. The world held no position in his heart. He was humble, refusing to be a king-prophet and choosing instead to be a servant-messenger. He ate and sat as a servant eats and sits. His asceticism (peace and blessings be upon him) and his detachment from the adornments of worldly life are too numerous to count.

Most of his Companions, in the early days of Islam, were in the same state or close to it. They lived in scarcity and want before the conquest of Khaybar. However, after the conquests and the world opening up to them, they busied themselves with spending in charity and equipping armies, and the world was not their desire.

The Companions were not oblivious to the state of the Prophet (peace and blessings be upon him). Rather, they would console him with grants, gifts, and hospitality, especially the Ansar. Months would pass over the Prophet's (peace and blessings be upon him) houses without a fire being lit in them. His neighbors among the Ansar would give him milk from their livestock, and people would seek to give their gifts on the day of Aisha, seeking the pleasure of the Messenger.

His household (peace and blessings be upon him) emulated him in this regard, preferring others over themselves, as Aisha (may Allah be pleased with her) did when she distributed one hundred thousand dirhams and kept nothing for herself.