You Must Says Al-hamdu lillah

عن أنس رضي الله عنه قال قال رسول الله صلى الله عليه و سلم : [ إن الله ليرضى عن العبد أن يأكل الأكلة فيحمده عليها أو يشرب الشربة فيحمده عليها ] رواه مسلم

Anas (May Allah be pleased with him) reported: Messenger of Allah (PBUH) said, "Allah will be pleased with His slave who praises Him (i.e., says Al-hamdu lillah) when he eats and praises Him when he drinks".

[Muslim].

Commentary: If a person expresses his gratitude to Allah for food, which besides being a source of nourishment is enjoyable for him, he gets a reward for it and thus even eating can become rewardable too.