Short answer: Most plain, dry nuts are permitted during Paryushan if your local maryada allows them, you inspect them for insects, and you take them in a simple way (no frying, no spice, no mixes) within the prescribed time (daytime, with boiled water).

Commonly acceptable when kept simple and clean

• Almonds (badam)
• Cashews (kaju)
• Walnuts (akhrot)
• Pistachios (pista)
• Hazelnuts, pine nuts, chironji (charoli)
• Dry coconut (kopra)
• Makhana/fox nuts
• Edible seeds used like nuts: sesame (til), melon/pumpkin seeds

Follow these Paryushan-specific cautions

• Keep it plain: raw or dry-roasted only; avoid oil, ghee, salt, sugar, masala, coatings, and mixes.
• Fresh/green or moist items are avoided; prefer well-dried, clean nuts.
• Sort and inspect the same day; avoid anything with even slight infestation or fungus.
• Timing: take only within your daily food-time vow; water should be boiled as per your maryada.
• Processing: avoid nut butters, flavored nuts, and confectionery (risk of fermentation/impurities).

About specific items and vows

• Peanuts/groundnuts: Many maryadas avoid them in Paryushan (they grow underground and are infestation-prone). Follow your local guidance.
• Ayambil: generally avoids oily items; most nuts are therefore not taken. Some traditions may allow limited seeds like sesame—only if explicitly permitted by your guru/maryada.
• Upvas (fast): no food. Ekasana/Beasana: nuts can be part of the single meal if allowed locally and kept plain.

Tradition note

• Both Shvetambar Paryushan and Digambar Das Lakshan emphasize aparigraha and asan-viśuddhi (purity of intake). Exact permissions vary by sangh and local maryada. Always follow the guidance of your guru/temple.