During Paryushan, Jains observe increased austerity, self-discipline, and focus on spiritual practices. Dietary restrictions are an important aspect of this period.

Regarding tea and coffee:

• Strict Observance: Many devout Jains avoid consuming tea and coffee during Paryushan. This is because both beverages often contain microorganisms (like tiny insects or bacteria in tea leaves or coffee beans), and boiling them may not eliminate all life forms, which goes against the principle of ahimsa (non-violence).
• Fermentation: Some Jains also avoid items that involve fermentation or are considered stimulating (like caffeinated drinks), as these can disturb the mind and hinder spiritual progress.
• Milk and Derivatives: Some sects also avoid dairy and its derivatives, especially if there's any doubt about the purity or harm to living beings in the process.

Variations: Practices can vary based on family tradition, sect (Shwetambar, Digambar, Sthanakvasi, Terapanthi, etc.), and personal vows. Some Jains might allow tea/coffee if prepared with strict care, while others abstain completely.

In summary: It is generally recommended to avoid tea and coffee during Paryushan to uphold the spirit of ahimsa and tapas (austerity), but the exact practice depends on individual and community traditions. If in doubt, consult your family elders or local Jain sangh.