It seems you may be asking about “Upvas” (fasting) rather than “Uvvasagh sharam.” In Jainism, fasting is a vrata (discipline) that helps purify the soul and reduce karmic bondage. Here are the commonly taught benefits:

• Spiritual purification: Fasting slows down the senses and mind, aiding self-control and detachment from material comforts.
• Karma reduction: By limiting bodily pleasures and focusing on right conduct, fasting helps burn or prevent new karmas.
• Mental clarity and equanimity: Regular fasting strengthens discipline, steadies emotions, and cultivates inner calm.
• Preparation for higher austerities: Fasting is often a step on the path toward deeper vows and spiritual practices, especially during occasions like Paryushan and Ayambil.
• Compassion and humility: By sharing meals or fasting with others, one cultivates humility, generosity, and empathy.

If you meant a different term or a specific rite (for example a particular fasting practice or recitation), please spell it as you hear it and I’ll address it directly.