In Jainism, whether you can eat bread depends mainly on how it is made:

1. Normal bakery bread (with yeast)

• Most market bread (white, brown, pav, buns, pizza base, etc.) is made with yeast.
• Yeast is a living organism, and fermentation multiplies countless tiny lives.
• Because Jain dharma is based on ahiṁsā (non‑violence) even towards microscopic life, many Jains avoid yeast‑bread completely in daily life, and almost all avoid it during Paryushan / big vows. ( jainknowledge.com)

So, ordinary yeast bread is generally not considered proper Jain food, especially for someone trying to follow strict Jain rules.

2. Yeast‑free / unleavened bread

Generally allowed, if other Jain rules are followed:

• Chapati / roti / phulka / bhakhri / puri – made fresh, without yeast, are fully acceptable as normal Jain food.
• Some packaged “yeast‑free breads” exist; more careful Jains still avoid them because:

- factory‑made, many additives - not freshly prepared - sometimes hidden fermentation.

Best and safest: Fresh, home‑made, simple flatbreads (roti, chapati, etc.) cooked and eaten in daylight.

3. During Paryushan / special vows

• Both Śvetāmbara and Digambar traditions avoid all fermented foods, including bread with yeast. ( jainknowledge.com)
• Many also avoid any bakery / packet bread, even if “yeast‑free”, to keep maximum simplicity and saiyam.

Summary

• Daily life (average Jain):

- Better to avoid yeast‑bread; choose roti/chapati and other unleavened breads.

• Serious/strict practice & festivals (Paryushan, Chaturmās, special vrats):

- No bread with yeast, no fermented or factory‑style bread at all; only simple, fresh home‑made food.

If you wish to be on the safe and dharmic side, avoid bakery bread and eat fresh, simple roti/chapati instead.