Answer

During Paryushan, it is best to avoid Diet Coke or any soft drink.

Explanation

Paryushan is a sacred time for:

• self-discipline
• simplicity
• control over taste
• reducing attachment to food and drinks
• spiritual purification

Even if Diet Coke may not be “food” in the usual sense, it is still a processed, taste-based drink. Many Jain families and traditions avoid such items during Paryushan because they do not support the spirit of restraint and purity.

Also, during Paryushan, many people follow stricter rules such as avoiding:

• processed foods
• outside food and drinks
• fermented or questionable ingredients
• items taken only for taste or craving

Spiritual Understanding

The purpose of Paryushan is not only to avoid certain ingredients, but to reduce rāga — attachment and craving. Avoiding Diet Coke can be a small but meaningful act of self-control.

Takeaway

If you are observing Paryushan sincerely, it is better to drink simple permitted drinks like boiled water according to your family’s Jain practice, and avoid Diet Coke.