Ayambil is a Jain vrata (discipline) in which a person consumes very simple, bland food to practice non-violence (ahimsa) and control over the senses. The reason for eating bland food during ayambil is not about taste or nutrition alone, but about inner purification and mindfulness:

• Minimizing harm: Bland, minimal meals reduce desires and the number of ingredients that might involve hurting living beings in production.
• Senses discipline: Simple food helps curb attachment to flavors, aromas, and gourmet comforts, strengthening restraint and self-control.
• Mental clarity: Less spice and fewer ingredients support steady concentration and remembrance of the Jain vows during the vrata.
• Humility and detachment: The austere diet fosters humility, gratitude, and a focus on spiritual goals rather than bodily pleasures.
• Purity of intention: Ayambil is done with a sincere intention to purify mind, speech, and body, and to accumulate merit through steady practice.

Notes:

• The exact foods and the number of days can vary slightly between Digambar and Shwetambar communities, but the core principle—eating simply to cultivate restraint and compassion—remains the same.
• Often the meals are prepared with minimal spice, using basic grains, lentils, milk or yogurt, and occasionally plain vegetables, avoiding root vegetables or ingredients that require heavy processing, depending on local practice.

You can read more about ayambil here