Breakdown of Правильное питание нужно для иммунитета, притом оно даёт силы.
оно
it
давать
to give (imperfective)
нужен
needed (short form)
для
for
Questions & Answers about Правильное питание нужно для иммунитета, притом оно даёт силы.
How does притом work in this sentence, and could I use причём instead?
Притом is a conjunction used to add extra, supporting information, similar to "besides" or "moreover" in English. Here, it adds a second benefit to proper nutrition. Yes, you could absolutely use причём here! They are mostly interchangeable, though причём often feels slightly more closely tied to the action of the first clause, while притом just adds an additional related fact.
Why is притом written as a single word? Is it the same as при том?
They are different! Written as one word, притом is a conjunction meaning "moreover" or "besides." If you write it as two words (при том), it becomes the preposition при followed by the prepositional case of тот (that). You would use the two-word version in phrases like при том условии (on that condition).
Why do we use the short adjective нужно instead of the full form нужное?
In this sentence, "is necessary" acts as the main action (the predicate) of the first clause. In Russian, short adjectives like нужно are used specifically to play this verb-like role. If you used the full form нужное, the sentence would translate to "the necessary proper nutrition..." and would be left hanging without a verb.
The English translation says "gives strength" in the singular. Why is силы plural?