In Jainism, “eating only once a day” is mainly a monk/nun discipline, not a rule for ordinary householders.

Very simply:

• All Jain sects allow lay people (shrāvaks / shrāvikās) to eat more than once a day.

The common discipline is: - Eat only in the daytime (before sunset) - Avoid eating at night - Follow extra rules on special days (upvas, ekasana, etc.)

• Monks and nuns:

- Digambar monks: traditionally eat only once a day, taking alms from several houses. - Many Śvetāmbara monks/nuns: in some sub‑sects eat once, in some they may eat twice in a day (always with many rules and before sunset).

So yes, there are Jain groups where ascetics eat more than once, and in every sect the household followers are not required to eat only once a day. The strict “once a day” practice is a voluntary higher vow, mainly for ascetics or very strictly practising lay Jains on special days.