Έχοντας φάει δύο κομμάτια πίτα, δεν ήμουν πια νηστικός, αλλά δεν ήμουν και πολύ χορτάτος.

Έχοντας φάει means having eaten.

It is an introductory phrase that gives background to the main clause, something like:

• Having eaten two pieces of pie...
• After eating two pieces of pie...

By contrast, έφαγα means I ate and is a normal finite verb.

So:

• Έφαγα δύο κομμάτια πίτα = I ate two pieces of pie
• Έχοντας φάει δύο κομμάτια πίτα, ... = Having eaten two pieces of pie, ...

In this sentence, the speaker is not mainly telling us the action of eating; they are setting up the situation before telling us how they felt afterward.

Έχοντας is an adverbial participle of έχω.

It is invariable, which means it does not change for:

• person
• number
• gender

So you use έχοντας the same way whether the subject is I, you, he, she, we, etc.

In this sentence, έχοντας works together with φάει to mean having eaten.

Because after έχοντας, Greek uses the non-finite form φάει.

Here is the difference:

• έφαγα = I ate
  This is a normal past-tense verb.
• τρώγοντας = eating / while eating
  This suggests the action is ongoing.
• έχοντας φάει = having eaten / after eating
  This shows the eating is already completed before the next part.

So Έχοντας φάει focuses on a completed action that happened before the speaker’s state of being not hungry anymore, but not very full either.

Yes, normally it does.

In this sentence, the understood subject of έχοντας φάει is the same person as the subject of ήμουν:

• I, having eaten two pieces of pie, was no longer hungry...

This is the normal pattern in Greek with this kind of participial phrase. If the subject changed, the sentence would usually need to be reworded to avoid confusion.

This is a very natural question.

You may expect δύο κομμάτια πίτας, which is also possible and sounds more explicitly like two pieces of pie.

But in everyday Greek, especially with food, people very often use a structure like:

• ένα κομμάτι πίτα
• δύο κομμάτια πίτσα
• ένα ποτήρι νερό

So κομμάτια πίτα is a common, natural colloquial way to say pieces of pie.

Very roughly:

• κομμάτια πίτας can sound a bit more formally grammatical or more clearly pieces of a pie
• κομμάτια πίτα is very common in everyday speech

In this sentence, πια means any longer / anymore / no longer.

So:

• δεν ήμουν πια νηστικός = I was no longer hungry

This is one of the most common uses of πια: with a negative verb, it often means that something used to be true before, but is not true now.

They describe opposite food-related states:

• νηστικός = hungry, literally also fasting / on an empty stomach
• χορτάτος = full, satisfied from food

So the speaker is saying:

• after eating, they were not hungry anymore
• but they were not very full either

That creates a nice middle state: the food helped, but it was not enough to make them feel really full.

Because they agree with the speaker.

Greek adjectives change for gender and number, so if the speaker is male, you get:

• νηστικός
• χορτάτος

If the speaker were female, you would say:

• νηστική
• χορτάτη

The verb ήμουν stays the same, but the adjectives show the gender.

This και is not the basic and.

In this kind of sentence, και adds a nuance like:

• really
• all that
• exactly
• particularly

So:

• δεν ήμουν και πολύ χορτάτος means something like
  I wasn’t very full either
  or
  I wasn’t all that full

It makes the statement sound more natural and idiomatic.

Yes, Greek could leave it out, but repeating it is very natural here.

Full version:

• δεν ήμουν πια νηστικός, αλλά δεν ήμουν και πολύ χορτάτος

Possible shorter version:

• δεν ήμουν πια νηστικός, αλλά και πολύ χορτάτος όχι

But the repeated ήμουν makes the contrast clearer and more balanced:

• I was no longer hungry, but I wasn’t very full either

It sounds smooth and natural.

Yes.

For example:

• Αφού έφαγα δύο κομμάτια πίτα, δεν ήμουν πια νηστικός...

This also means After I ate two pieces of pie...

The difference is mainly stylistic:

• Έχοντας φάει is a bit more compact and participial
• Αφού έφαγα is more straightforward and clause-based

Both are correct, but Έχοντας φάει gives the sentence a slightly more polished or written feel.

Yes, it is natural.

It sounds like a thoughtful, everyday statement with slightly polished wording. A native speaker could absolutely say it, especially in conversation or informal writing.

The sentence has a nice contrast:

• not hungry anymore
• but not very full either

So it communicates a very specific, realistic feeling: the speaker ate enough to stop being hungry, but not enough to feel properly full.