Jains can eat curd in some traditions, but it is not simple or universally allowed. It depends on:

1. Ahimsa principle (non‑violence)

- Curd is fermented, so it contains many living microorganisms (bacteria). - Eating it means destroying many one‑sensed beings (ekindriya jiv). - Because of this, many serious Jains avoid curd, or eat it with strict rules.

1. When some Jains still take curd

In households where curd is allowed, they usually follow conditions like: - Made from boiled and cooled milk. - Freshly set (few hours old, not sour). - Eaten only in daytime, not after sunset. - Not kept overnight and not very sour / over‑fermented. This is seen as minimising himsa compared to very old or strongly fermented foods.

1. Differences in practice

- Monks (both Digambar and Shvetambar): generally do not take curd or fermented foods. - Strict lay Jains: often avoid curd completely, or at least on: - Paryushan / Das‑Lakshan - Ayambil, upvas, other special vows - Other lay Jains: some still eat curd as part of traditional family practice, following the “fresh, daytime, limited” rules.

1. Modern view

- Many Jains now also worry about dairy cruelty (to cows and calves), so they: - Reduce or stop milk and curd - Shift to vegan options, considering this closer to true ahimsa.

So, how can Jains eat curd? Only by:

• Treating it as an allowed but not ideal item for householders,
• Taking it fresh, in small quantity, in daytime,
• And understanding that avoiding curd altogether is spiritually higher, because it reduces both microbial and animal himsa.

If you want more detailed discussion on curd in Jainism, you can read further here: Curd and Jainism Why Jains eat (or avoid) curd despite bacteria