Answer

In Jain practice, dahi (curd/yogurt) is generally avoided during Paryushan, especially by those observing stricter rules of food purity and restraint.

Explanation

During Paryushan, Jains try to follow greater discipline in food, speech, thoughts, and actions. Many people avoid items that involve more microbial life or fermentation, such as:

• Dahi / curd / yogurt
• Buttermilk made from dahi
• Fermented foods
• Stale or leftover food

However, exact rules can vary by family tradition, sect, local sangh, and personal level of vow.

Spiritual Understanding

Paryushan is a time for increased ahimsa, self-control, simplicity, and purification of the soul. Avoiding dahi is part of reducing harm to subtle living beings and practicing restraint in taste.

Takeaway

If you are observing Paryushan traditionally, it is best to avoid dahi. For your exact rule, follow your guru, local sangh, or family tradition.