Short answer: Maida (refined wheat flour) itself is not expressly forbidden in Paryushan. But the vrata emphasizes aparigraha and simple, non‑violent food. So follow these:

• Prefer simple, light, whole grains (like atta) over refined maida.
• If you do use maida, take it only as very simple, freshly prepared food, made at home, eaten in daylight.
• Strictly avoid any fermentation or yeast: no bread/pav, buns, pizza bases, khaman/idhli-type batters, or bakery items.
• Avoid outside/packaged foods and rich/fried or fancy preparations; keep it minimal and sattvik.
• Follow your declared pachchakkhān and your sangh/guru’s maryādā. If in doubt, abstain.

Essence: Not a direct “nishedh,” but best practice in Paryushan is to avoid refined/bakery items and keep food as simple and pure as possible.

For simple do’s and don’ts during Paryushan, see:

• What can’t we eat in Paryushan
• What all foods are allowed in Paryushan