Answer

Jains traditionally avoid foods that involve harm to living beings, especially:

• All meat, fish, and eggs
• Honey
• Alcohol and intoxicants
• Root vegetables such as:

- onion - garlic - potato - carrot - beetroot - radish - ginger - turmeric in some traditions may be avoided in certain forms - and other underground vegetables

• Fermented foods in many Jain traditions, such as:

- curd after a certain time - idli/dosa batter if it is fermented - alcohol-based or strongly fermented items

• Foods cooked or stored in ways that may harm many living beings, especially stale or overnight food in stricter observance

Explanation

The main Jain principle behind food rules is ahimsa, or non-violence. Jains try to eat in a way that causes the least harm possible.

Root vegetables are avoided because pulling them out destroys the whole plant and also disturbs many tiny living beings in the soil. Meat, fish, and eggs are avoided because they come directly from killing animals. Honey is avoided because it involves harm to bees. Fermented foods are often avoided because fermentation can involve many microorganisms and also because of impurity concerns in some traditions.

Spiritual Understanding

Food is not only seen as nourishment in Jain Dharma; it is also connected to compassion, self-control, and purity of conduct. By avoiding harmful foods, a Jain tries to reduce violence, weaken attachment, and support a peaceful, disciplined life.

Takeaway

In simple words, Jains avoid food that involves killing, hidden harm to life, or strong intoxication. The exact level of observance can vary by family, sect, and personal vow, but ahimsa remains the core principle.