Answer

Generally, during Ekashna in Paryushan, one should eat and drink only during the single fixed meal time. So Boost should not be taken outside the Ekashna meal.

If you take Boost, it should be taken only within your Ekashna sitting, and only if it is acceptable according to your family, guru, or local Jain practice.

Explanation

Ekashna means eating only once in a day, in one sitting. During Paryushan, the purpose is to reduce attachment to taste, comfort, and food.

Boost is not just plain water; it is a flavored nutritional drink. So it is generally treated as food/drink nourishment, not as simple water.

Also, many Jain households observe stricter rules during Paryushan, such as avoiding processed items, packaged powders, or ingredients that may not be suitable.

Spiritual Understanding

The spirit of Ekashna is:

• Control over taste
• Limiting food intake
• Reducing desires
• Increasing self-discipline and awareness

So even if something is technically allowed by some people, one should ask: “Is this helping my tapasya, or is it mainly for taste and comfort?”

Takeaway

If needed for health, take guidance from your parents, doctor, or Jain guru. Otherwise, during Paryushan Ekashna, it is better to avoid Boost, especially outside the one meal.