The Buddha praised moderation in eating (Sn.707) and encouraged this in his monks and nuns. To this end and for reasons of health, he made a rule that they should not eat after noon.
‘I do not eat in the evening and thus I am free from illness and affliction and enjoy health, strength and ease’
The Buddha also suggested to his disciples that they recite these words as a reflection before eating. ‘We will eat in moderation. Reflecting wisely we will not eat for fun, for amusement or for physical attractiveness but only for the maintenance and continuance of this body, for allaying the discomfort of hunger, for assisting in living the holy life and with the thought “I will end the old desires and not give rise to new ones and thus be healthy, blameless and live in comfort” ’ (M.I,273).
Taking the 8 precepts is sort of like going on a mini-retreat where there is more intensive practice. To this end, following some of the bhikkhu / bhikkhuni precpts is advisable to have better concentration, tranquility for the practice. In addition:
1. It is good for health, to consume all the food at once and walk (exercise it off later).
2. It places less of a burden on lay people who will only need to provide food for one meal, instead of many meals.
3. It allows for more time to be spent on the practice and teaching of Dhamma.