Si sigues usando tanta canela, el sabor va a cambiar mucho.

In Spanish, after si meaning if for real or likely situations, you normally use the present tense, not the future:

• Si sigues usando tanta canela... = If you keep using so much cinnamon...

Even though the meaning refers to the future, Spanish usually keeps the if-clause in the present.

Compare:

• Si vienes mañana, te ayudo. = If you come tomorrow, I’ll help you.

Using si + future is generally incorrect in this kind of sentence.

Seguir + gerundio means to keep doing or to continue doing something.

So:

• sigues usando = you keep using / you continue using

This adds the idea that the person is already doing it and has not stopped.

Compare:

• Si usas tanta canela... = If you use that much cinnamon...
• Si sigues usando tanta canela... = If you keep using that much cinnamon...

The second one sounds more like a warning about an ongoing habit.

Tanta means so much or that much.

It agrees with the noun it describes:

• tanto for masculine singular
• tanta for feminine singular
• tantos for masculine plural
• tantas for feminine plural

Since canela is feminine singular, you get:

• tanta canela = so much cinnamon

Both are possible, but they are not exactly the same.

• mucha canela = a lot of cinnamon
• tanta canela = so much cinnamon / that much cinnamon

Tanta is often more emphatic. It can suggest excess or surprise. In this sentence, it helps give the idea that the amount is too large and will affect the flavour.

In Spanish, canela is an uncountable noun here, like sugar or water in English. Uncountable nouns are often grammatically singular.

So:

• mucha canela
• tanta canela

not:

• tantas canelas unless you mean different kinds or varieties of cinnamon

Va a cambiar is the periphrastic future: ir a + infinitive.

It means:

• is going to change
• sometimes simply will change

So:

• el sabor va a cambiar mucho = the flavour is going to change a lot

This structure is extremely common in everyday Spanish.

Yes. You could say:

• Si sigues usando tanta canela, el sabor cambiará mucho.

This is correct and means basically the same thing.

The difference is mostly one of style and tone:

• va a cambiar sounds very natural and conversational
• cambiará can sound a bit more neutral, formal, or predictive

In everyday speech, ir a + infinitive is very common.

Spanish often drops subject pronouns because the verb ending already tells you who the subject is.

• sigues clearly means you (informal singular)

So:

• Si sigues usando tanta canela...

already means If you keep using so much cinnamon...

You could say si tú sigues usando..., but that would usually add emphasis, contrast, or emotion.

Spanish often uses the definite article more often than English does.

• el sabor = the flavour / the taste

Here it refers to the flavour of the thing being discussed, so el sounds natural. English may or may not use the depending on context, but Spanish usually does here.

It can mean both, depending on context.

• sabor = taste, flavour

In this sentence, flavour is often the more natural translation in English, because the sentence is about how the cinnamon affects the overall result. But taste is not wrong.

Here mucho works like an adverb meaning a lot or greatly.

• cambiar mucho = to change a lot

Placing it after the verb is the normal position.

Compare:

• va a cambiar mucho = it’s going to change a lot

This mucho does not change form because it is modifying the verb, not a noun.

It is an adverb here.

Why? Because it modifies cambiar:

• change a lot

When mucho modifies a verb, it usually stays in the invariable adverb form:

• trabaja mucho
• come mucho
• va a cambiar mucho

But when it modifies a noun, it agrees:

• mucha canela
• muchos libros

In many contexts, sabor is the better choice for flavour/taste of food.

• sabor = flavour, taste of food
• gusto can sometimes mean taste too, but it is also very commonly liking or preference

In Spain, sabor sounds more natural in a sentence like this about how cinnamon affects food.

This is a real or likely condition:

• Si + present, followed by a result in the future or near future

Pattern:

• Si + presente, ir a + infinitivo
• or Si + presente, futuro

So this sentence follows a very common pattern:

• Si sigues usando tanta canela, el sabor va a cambiar mucho.

It means the consequence is realistic and expected.

Sometimes, yes, depending on the nuance.

For example:

• Si usas tanta canela... = If you use that much cinnamon...
• Si continúas usando tanta canela... = If you continue using that much cinnamon...

But seguir + gerundio is especially common and natural in spoken Spanish for keep doing.

So sigues usando is a very idiomatic choice.

After seguir when you mean to keep doing something, Spanish usually uses a gerund:

• seguir + gerundio

So:

• seguir usando = to keep using
• sigues usando = you keep using

The infinitive usar would not work the same way here.

Yes, it sounds very much like a warning or caution.

• Si sigues usando tanta canela, el sabor va a cambiar mucho.

The speaker is saying that the current behaviour will have a noticeable negative or at least strong effect. The exact tone depends on context, but it often suggests:

• That’s too much cinnamon
• Be careful, because it will affect the result

So grammatically it is a conditional sentence, but pragmatically it often functions as a warning.