In Daśa-lakṣaṇa-parva (the 10 Lakṣaṇa days), the main focus is on restraint in eating and simple, non-harmful food. There are three levels of practice for food during this period:

• Dietary restrictions (lowest form): Avoid certain foods, especially those causing violence or heavy taming of the mind. Commonly, practitioners refrain from root vegetables and other items that are hard to digest or cause disturbance.
• Partial fasting: Eat only a limited amount of food per day (often one sattvik meal) and keep the meals simple and plain.
• Complete fasting: Some Digambar Jains may go to the extreme of drinking only boiled water for a period, taking care that the water is boiled to ensure there is no life in it.

A widely observed practice during Daśalakṣaṇa is to follow a sattvik diet—no onion, no garlic, and no root vegetables—often with only one meal before sunset if not fasting completely. Water, if consumed, is typically boiled in the more stringent forms. The exact level one adopts (dietary restriction, ekasana, or complete fast) varies by individual and tradition (Digambara vs. Śvetāmbara). ( jainpedia.org, jaina.org, jainheritagecentres.com)