Когда мне хочется чего‑то лёгкого, я пью кефир и ем лапшу без соуса.

Мне хочется literally means something like it is wanting itself to me or I feel like.

It is a very common Russian way to talk about a desire, especially:

• a passing feeling
• a craving
• something you’re in the mood for

So:

• Я хочу кефир. = I want kefir.
• Мне хочется кефира. = I feel like kefir / I’m in the mood for some kefir.

In this sentence, мне хочется sounds natural because the speaker is talking about what they tend to choose when they feel like eating something light.

Because the construction хочется uses the person experiencing the feeling in the dative.

So:

• мне хочется = I feel like
• тебе хочется = you feel like
• ему хочется = he feels like

This is similar to other Russian patterns where a feeling or state is expressed as happening to someone:

• мне холодно = I’m cold
• мне нравится = I like it
• мне хочется = I feel like it / I want

So мне is not the subject here in the English sense. It marks the experiencer.

Because after хочется, Russian very often uses the genitive when talking about wanting some amount of something or something indefinite.

So:

• что-то is nominative/accusative
• чего-то is genitive

And the adjective has to match:

• лёгкое → nominative/accusative neuter singular
• лёгкого → genitive neuter singular

So чего‑то лёгкого means:

• something light
• more literally, some light thing / something of a light kind

This is especially common with food and drink:

• хочется чая = I feel like some tea
• хочется супа = I feel like soup
• хочется чего-нибудь сладкого = I feel like something sweet

Because it agrees with чего-то, which comes from что.

The pronoun что is grammatically neuter singular, so any adjective modifying it is also neuter singular.

That is why you get:

• что-то лёгкое
• чего-то лёгкого

Even though in English something light doesn’t feel grammatically neuter, in Russian что is neuter, so the adjective follows that grammar.

Here it means light in the sense of:

• not heavy
• easy to digest
• not rich
• simple food

So this is the kind of light you use for meals, not physical weight.

Examples:

• лёгкая еда = light food
• что-нибудь лёгкое = something light

It does not mean the food literally weighs little.

Because лапша is the direct object of ем, so it goes into the accusative case.

For this noun:

• nominative: лапша
• accusative: лапшу

This is normal for feminine nouns ending in -а:

• я читаю книгу
• я вижу машину
• я ем лапшу

So:

• лапша = dictionary form
• ем лапшу = I eat noodles

Because the preposition без always requires the genitive case.

So:

• соус → nominative
• соуса → genitive

Other examples:

• без сахара = without sugar
• без молока = without milk
• без соли = without salt
• без соуса = without sauce

This is a good phrase to memorize as a pattern:

без + genitive

The sentence describes a habitual or typical action:

When I feel like something light, I drink kefir and eat noodles without sauce.

In Russian, the present tense of the imperfective verb is commonly used for habits and repeated actions.

So:

• пью = I drink
• ем = I eat

These forms can mean:

• what I am doing now, depending on context
• what I usually do, as here

The time meaning comes from context.

Yes. Пить and есть are imperfective verbs here.

That matters because the sentence is about a repeated, general pattern, not one completed event.

Imperfective present is the normal choice for:

• habits
• routines
• general truths
• repeated behavior

So:

• я пью кефир = I drink kefir / I usually drink kefir
• я ем лапшу = I eat noodles / I usually eat noodles

If you were talking about one completed future action, Russian would use perfective future forms instead.

Когда means when and introduces a time clause.

So the structure is:

• Когда мне хочется чего-то лёгкого, ...
• When I feel like something light, ...

This is very common in Russian:

• Когда я устаю, я пью чай.
• Когда холодно, мы остаёмся дома.

The clause with когда sets the situation, and the main clause tells what happens in that situation.

No, Russian word order is fairly flexible, although the given version is very natural.

Current order:

• Когда мне хочется чего‑то лёгкого, я пью кефир и ем лапшу без соуса.

You could also say:

• Я пью кефир и ем лапшу без соуса, когда мне хочется чего‑то лёгкого.

Both are grammatical. The difference is mostly one of emphasis and flow:

• putting the когда clause first sets the scene first
• putting it later makes the actions come first

The original sentence sounds smooth and natural because it starts with the condition/situation.

Yes, absolutely.

Both are natural, but the nuance is a little different:

• чего-то лёгкого = something light
• чего-нибудь лёгкого = something light, anything light

Very roughly:

• чего-то can sound a bit more like some particular kind of thing
• чего-нибудь can sound a bit more open-ended: anything light will do

In many everyday situations, both work well.

И simply connects the two actions:

• я пью кефир
• и ем лапшу без соуса

So the speaker is saying that when they want something light, they do both of these things as their typical choice.

It does not necessarily mean they happen at the exact same second; it just links them as part of the same general situation or meal.

Here кефир is being used as an uncountable food/drink noun, more like kefir or some kefir in English.

Russian often uses the bare noun after verbs like пить:

• пью чай
• пью кофе
• пью кефир

English sometimes needs some, but Russian often does not.

So я пью кефир naturally means I drink kefir or I drink some kefir, depending on context.