太らないように気をつけているの？

to grow fat (stout, plump); to become fat; to gain weight

in order to (e.g. meet goal); so that; take care (so as); hoping or wishing for something

spirit; mind; heart; nature; disposition; motivation; intention; mood; feelings; atmosphere; essence

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to turn on; to switch on; to light up

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question