Answer

Generally, strict Jain ethics do not favor the use of yeast for baking.

Explanation

Yeast is a living microorganism. In Jain dharma, अहिंसा means avoiding harm to all forms of life as far as possible, including very small living beings. Since yeast is intentionally used to make dough rise through fermentation, many observant Jains prefer to avoid yeast-leavened breads, buns, and similar foods.

That said, actual practice can vary by family tradition and level of observance. But the more conservative Jain view is to avoid yeast when possible.

Spiritual Understanding

Jain ethics are based on careful restraint and compassion. The goal is not only to avoid obvious violence, but also to reduce subtle harm in daily life. Avoiding yeast is one way some Jains try to keep their food choices more aligned with ahimsa.

Takeaway

If you want to follow the stricter Jain standard, it is better to avoid yeast and choose unleavened or non-fermented alternatives.