In Jainism, all living beings are to be treated with non-violence (ahimsa). Mushrooms are fungi and are considered living organisms. Because of this, many Jain teachers advise caution or avoidance when it comes to consuming mushrooms, especially for those who follow a strict ahimsa practice.

• General stance: The Jain principle of non-violence encourages avoiding products that involve harming living beings. Since mushrooms are life forms, consuming them can involve harm, so many Jains choose not to eat them.
• Variations: There is no single, definitive rule across all Jain communities. Some Digambar and Shvetambar adherents may avoid mushrooms, while others may permit them in limited or practical circumstances, often depending on personal conscience and community guidance.
• Practical guidance: If you are following Jain dietary norms with strict ahimsa in mind, you would likely refrain from mushrooms. If you are part of a Jain community or tradition that places more emphasis on other factors (like hunger, necessity, or cultivation methods), you might encounter differing practices.

If you’d like, I can share more detailed, tradition-specific notes (Digambar vs. Shvetambar) or point you to specific Jain texts that discuss right food and ahimsa in more depth.