In Jain Dharma, the key point is: nidaan is in the bhaav (inner intention), not in the mere passing of a thought.

You described it very honestly, so let’s separate things clearly:

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1. What is nidaan here?

In this context, nidaan means:

• To consciously and willingly make an inner resolve like:

- “Because I did this upvaas, I must get very tasty food.” - “I am fasting so I get this specific result / comfort / pleasure later.”

• This is a kind of desire-based planning for future pleasure, tied to a punya-karma you are doing now.

So, nidaan is:

• not just “I felt like it”,
• but “I want this, I mentally hold on to it, I am pleased with this desire and I nourish it.”

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2. When thoughts come automatically in samayik

What you’re describing is common and well-understood in Jain psychology of karma:

• Because of past karmas and habits, random thoughts arise on their own.
• In samayik, you will sometimes see:

- greed-thoughts, - pride-thoughts, - anger-thoughts, - food-craving thoughts, etc.

If the thought comes as: > “As a result of this upvaas I must get extremely tasty / good food”

but in your heart you do not want to think it, and you:

• feel uneasy about it,
• do not approve of it,
• do not enjoy or encourage it,
• try to bring the mind back to equanimity,

then, according to Jain principles:

• This is more like a uday of past karma / old sanskār,

not a fresh, strong nidaan.

• The main bondage comes when you:

- accept, relish, and repeatedly foster that desire.

So:

• Passing, unwanted thought = lighter fault.
• Knowingly holding, enjoying, repeating the desire = actual nidaan-bhaav.

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3. What should you do in that moment?

Practical Jain way:

1. Become aware, without fear

- Silently note: “This is wrong lalasā (craving), I do not support it.” - Awareness itself starts weakening it.

1. Gently change the bhāva

- You can think: - “I did upvaas to reduce rāg–dveṣ, not to increase taste-craving.” - “True phala of upvaas is kashāya-kṣay (weakening passions) and samta, not tasty food.” - Turn attention to: - Navkār mantra, - meaning of samayik, - or contemplation of aatma.

1. Do alpa pratikraman in mind

- In very simple words, in your own language: - “Bhagwan, such thoughts are not right. Jo galti ho gayi, uske liye kshamā. Aage se aise bhaav na ho.” - This changes the inner current from craving → humility and purification.

1. Do not panic or feel guilty again and again

- Over-guilt can also become attachment (to the idea “I am bad”). - Better: accept, correct, and calmly move on in samayik.

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4. Does this become serious nidaan?

From your description:

• You did upvaas,
• at night you did samayik,
• the thought came against your will, and
• you were disturbed by it, not happy with it.

This suggests:

• It is more like an arising of old habit / karma,
• not a fully-formed, delighted, repeatedly planned nidaan.

To make it real nidaan, one generally:

• accepts the thought,
• repeats it many times with joy,
• connects the present tapa very deliberately to future sense-pleasure.

You are doing the opposite: you are worried about purity of bhāva. That concern itself is a sign of good samyak-dṛṣṭi tendency.

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5. How to gradually purify such cravings

Going forward, a few gentle practices:

1. Before starting upvaas

- Set a clear inner resolve: - “I am doing this upvaas: - to reduce passions (krodh, mān, māyā, lobh), - to purify aatma-bhāva, - not for taste, praise, or comfort.”

1. During upvaas

- If thoughts of future food come: - just see them like clouds, - don’t hold them, - bring mind back to: - mantra, - swādhyāy, - dhyān on qualities of Arihant.

1. After upvaas (parṇā time)

- Take simple food. - Avoid turning parṇā into a mini-feast. - Eat with the feeling: - “This is only for keeping the body fit for dharma, not for taste-enjoyment.”

Slowly, the mind learns: “Upvaas = vairāgya, not taste-excitement.”

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6. Summary in very simple words

• Automatic, unwanted thought of getting tasty food after upvaas

= not as serious as a deliberate nidaan.

• Nidaan is when you knowingly keep such a desire, are happy with it, and feed it.
• When such thoughts come:

- notice them, - reject them in your heart, - remember the true goal of upvaas, - do a little inner pratikraman, - return to mantra / dhyān.

Your honesty and awareness are already protecting you from strong nidaan-bhaav. Keep that simplicity and sincerity; over time, such thoughts will naturally weaken.

You can read a simple explanation about samayik and its purpose here