Ako budeš jela samo slatkiše, brzo ćeš ogladnjeti, zato uzmi i hrskav kruh s maslinama.

Because after ako when talking about a future condition, Croatian normally uses future II rather than future I.

• budeš jela = future II
• ćeš jesti = future I

So:

• Ako budeš jela samo slatkiše... = If you eat only sweets... / If you end up eating only sweets...

This is very common after words like ako (if), kad (when), čim (as soon as) when the action is in the future.

Using ako ćeš jesti would sound unnatural in standard Croatian.

Because the sentence is addressed to a female singular person.

In future II, Croatian uses forms of biti plus the past participle, and that participle agrees with the person's gender:

• to a woman: budeš jela
• to a man: budeš jeo

So this sentence is specifically being said to a woman or girl.

It is 2nd person singular future II of jesti (to eat).

It is built like this:

• budeš = 2nd person singular of budem-type auxiliary
• jela = past participle of jesti, feminine singular

So the full structure is:

• ti budeš jela = you will have eaten / you eat in a future conditional or time clause

In everyday English, it is usually translated simply as if you eat, even though the Croatian grammar is different.

Because slatkiše is the accusative plural, used for the direct object of jesti.

• singular: slatkiš = a sweet, a candy
• plural nominative: slatkiši
• plural accusative: slatkiše

Since the verb jesti takes a direct object, you need the accusative:

• jesti slatkiše = to eat sweets

Ogladnjeti means to become hungry or to get hungry.

So:

• gladan sam = I am hungry
• ogladnjet ću = I will get hungry

In this sentence:

• brzo ćeš ogladnjeti = you’ll get hungry quickly

This verb focuses on the change of state, not just the state itself.

Because the two clauses play different roles.

1. Ako budeš jela samo slatkiše
   This is the if-clause, so Croatian uses future II.

2. brzo ćeš ogladnjeti
   This is the main clause, so Croatian uses normal future I.

This pattern is very typical:

• Ako budeš učila, položit ćeš ispit.
• Ako dođeš rano, vidjet ćeš ga.

So the contrast is normal and expected.

Here zato means therefore, so, or that’s why.

It introduces a conclusion or recommendation based on what was just said:

• Brzo ćeš ogladnjeti, zato uzmi...
• You’ll get hungry quickly, so take...

It connects cause and result in a very natural way.

Uzmi is the imperative of uzeti (to take).

It is the 2nd person singular command form:

• uzmi! = take!

So the speaker is giving advice or a recommendation:

• zato uzmi i hrskav kruh s maslinama
  = so take some crunchy bread with olives too

If the speaker were talking to more than one person, it would be:

• uzmite

Because uzmi takes a direct object, and here the object is kruh.

For a masculine inanimate singular noun like kruh, the accusative looks the same as the nominative:

• nominative: kruh
• accusative: kruh

So:

• uzmi kruh = take bread

The adjective must agree with the noun:

• hrskav kruh = crunchy bread

So both words are in the appropriate form for a direct object.

Maslinama is instrumental plural.

The preposition s here means with, and it requires the instrumental case:

• s maslinama = with olives

So:

• singular: maslina = olive
• instrumental plural: maslinama

This is a very common pattern in Croatian:

• kava s mlijekom = coffee with milk
• pizza s gljivama = pizza with mushrooms
• kruh s maslinama = bread with olives

Here i is better understood as also or too, not just plain and.

• uzmi i hrskav kruh s maslinama
• take crunchy bread with olives too / also take crunchy bread with olives

The idea is: don’t take only sweets; take this additional food as well.

So in this sentence, i adds something extra.

Yes, Croatian word order is fairly flexible, although some versions sound more natural than others.

For example, you could also say:

• Brzo ćeš ogladnjeti ako budeš jela samo slatkiše, zato uzmi i hrskav kruh s maslinama.

That still means the same thing.

However, the original order is very natural because it presents:

1. the condition
2. the result
3. the advice

So even though word order can move around, the original sentence is well structured and idiomatic.