Η ποικιλία στη διατροφή είναι σημαντική για την υγεία.

Η is the feminine singular definite article, meaning the.

So:

• η = the for feminine singular nouns in the nominative case
• ποικιλία = variety

Together, Η ποικιλία means the variety.

Greek articles change according to gender, number, and case, unlike English the, which never changes.

ποικιλία means variety or diversity.

It is:

• feminine
• singular
• here in the nominative case, because it is the subject of the sentence

In this sentence, Η ποικιλία is the thing being described as important.

στη is simply the contracted form of σε τη.

So:

• σε = in / to / at
• τη = the (feminine accusative singular)
• στη = σε τη

This contraction is extremely common in modern Greek.

So στη διατροφή literally means:

• in the diet
• or more naturally here, in diet / in one’s diet

You will often see similar forms such as:

• στο = σε το
• στην is not standard modern usage; στη is used before consonants and vowels in normal spelling

διατροφή is in the accusative singular because it follows the preposition σε.

The basic dictionary form is:

• η διατροφή = diet / nutrition

After σε, nouns usually appear in the accusative in modern Greek:

• στη διατροφή = in the diet

So even though English just says in diet or in the diet, Greek shows this relationship by using both:

• the preposition σε
• the accusative form of the article and noun

Literally, it means in the diet.

But in context, it usually means something like:

• variety in the diet
• dietary variety
• a varied diet

So the Greek wording focuses on variety within what someone eats.

Depending on context, διατροφή can mean:

• diet
• nutrition
• eating habits

Here, diet is the most natural sense.

σημαντική is an adjective meaning important.

It ends in -ή because it must agree with ποικιλία, which is:

• feminine
• singular
• nominative

Greek adjectives agree with the nouns they describe in:

• gender
• number
• case

So:

• masculine: σημαντικός
• feminine: σημαντική
• neuter: σημαντικό

Because the subject is η ποικιλία, the adjective must be σημαντική.

In a sentence like this, είναι is normally used.

• είναι = is

So:

• Η ποικιλία στη διατροφή είναι σημαντική = Variety in the diet is important

In modern Greek, you generally keep the verb to be in this kind of statement. Leaving it out would sound unnatural or incomplete in ordinary prose.

για usually means for.

So:

• για = for
• την = the (feminine accusative singular)
• υγεία = health

Together, για την υγεία means:

• for health
• more naturally, for one’s health or for health in general

In this sentence, it expresses purpose, benefit, or relevance: variety in the diet is important for health.

Because υγεία comes after the preposition για, and after για, Greek uses the accusative.

Compare:

• η υγεία = health as a subject
• την υγεία = health as an object / after a preposition like για

So:

• Η υγεία είναι σημαντική. = Health is important.
• για την υγεία = for health

The article changes from η to την because the case changes.

In modern Greek, the final -ν in forms like την is often kept before:

• vowels
• and certain consonants

Since υγεία begins with a vowel sound, Greek keeps the -ν:

• την υγεία

This helps pronunciation flow more smoothly.

You may notice similar behavior with:

• τον
• δεν
• μην

Yes, Greek word order is more flexible than English, although the given order is very natural.

The sentence is:

• Η ποικιλία στη διατροφή είναι σημαντική για την υγεία.

This is a straightforward structure:

• subject: Η ποικιλία στη διατροφή
• verb: είναι
• adjective/complement: σημαντική
• prepositional phrase: για την υγεία

You might also see variations for emphasis, such as:

• Για την υγεία, η ποικιλία στη διατροφή είναι σημαντική.

That would emphasize for health more strongly.

But the original order is the most neutral and natural.

Yes. Greek often allows several natural ways to express the same idea. For example:

• Η ποικιλία στη διατροφή είναι σημαντική για την υγεία.
• Η διατροφική ποικιλία είναι σημαντική για την υγεία.
• Μια ποικίλη διατροφή είναι σημαντική για την υγεία.

These are slightly different in style:

• ποικιλία στη διατροφή = variety in the diet
• διατροφική ποικιλία = dietary variety
• ποικίλη διατροφή = a varied diet

The original sentence is very clear and natural, especially in educational or health-related contexts.

A very literal breakdown would be:

• Η = the
• ποικιλία = variety
• στη διατροφή = in the diet
• είναι = is
• σημαντική = important
• για την υγεία = for health

So, word for word:

The variety in the diet is important for health.

That is understandable in English, but a more natural English version is often:

• Variety in the diet is important for health.
• A varied diet is important for health.
• Dietary variety is important for health.

This is a good example of how Greek often uses the definite article where English may or may not use it in a more idiomatic translation.