The prophet Muhammad used to courage people to unite and not disunite through many means, among which is eating collectively. In this regard, Abu-Dawud and ibn Majah related that the companions of the Prophet complained that they eat and do not feel satiety. The Prophet asked them: you might eat singly? They replied: yes. The prophet said: eat collectively and mention the name of Allah on food, thus blessing of Allah would be granted to your food.

Accordingly, two stipulations are set to attain this blessing; to eat collectively, and to mention the name of Allah before eating.

Blessing is not only in food and its good impact on one's body, but it extends to improving family ties due to gathering on food daily.

http://300035.dotdothktrade.tech/en/artical/3407662/53-sunnah-eating-collectively