Here’s a simple Jain perspective on what is often avoided or limited on tithis (lunar days) and during fasting days:

• Core diet rules that usually apply

- Avoid harm to living beings in food choices: no meat, eggs, fish, or honey. - Most Jains abstain from root vegetables (like onions, garlic, potatoes, carrots, radish) as part of the general ahimsa and cleanliness norms. - Many people also avoid eating after sunset on rapid or upvas days; some observe a full fast with only water or fruit, depending on personal vow.

• During upvas/vrats (fasting days)

- Some followers do a partial fast: they may eat only fruits, or dairy products (like milk and yogurt) and avoid grains, pulses, and root vegetables. - In stricter fasts, no food is consumed at all for the day, sometimes with only water allowed. - Potentiate moderation: many choose light meals that exclude grains and legumes, but allow easily digestible dairy or fruit-based dishes, depending on the vow you’ve taken.

• Differences between Digambar and Shwetambar traditions

- There are differences in emphasis and practice. Digambar communities often emphasize stricter fasting practices for certain tithis, while Shwetambar communities may have more varied lay practices on specific days. The exact rules can vary by region, temple, and personal vow, so it’s best to confirm with your local guru or community guidelines.

• Practical note

- If you’re following a particular tithi or vow, check what your guru or temple guidance prescribes for that day. Diet can vary by tradition and by level of vow (partial fast vs. full fast).

If you’d like, tell me which community you follow (Digambar or Shwetambar) and the specific tithi you have in mind, and I can give a more precise, tradition-specific outline.