Tamasic food is that which can trigger negative thoughts and lethargy. This includes onion, garlic and mushroom etc.
Some vegetables are avoided during Sawan, such as leafy greens, eggplant, and root vegetables like potatoes and carrots.
Some people consume milk whereas some people avoid consuming milk during Sawan. It is believed that milk should be offered to the lord shiva.
This is a common practice during any Hindu fasting period. Since Sawan is dedicated to Lord Shiva, who is believed to be a vegetarian, devotees avoid meat, fish, and eggs.
Salt is considered as the item which can break the fast as per the rituals. It is better to avoid eating common salt.
Spicy food can irritate the digestive system, so some people choose to avoid it as a precaution.