~을 줄이다 = cut down on ~

You really should cut down on smoking

넌 정말 담배 줄여야해

You have to cut down on alcohol

술도 좀 줄이고 말야

We are trying to cut down on electricity consumption

우리는 전력소비를 줄이기 위해 노력하고 있습니다

The government has announced that 

it will cut down on welfare expenditure.

정부는 복지 비용을 줄일 것이라고 발표했다

The doctor advised him to cut down on coffee consumption

의사는 그에게 커피 섭취를 줄이라고 조언했다

I am going to cut down on surfing the Internet

인터넷 서핑 줄일거야 

You need to cut down on fatty foods if you wanna lose weight

너 살 빼고 싶으면 기름진 음식 줄여야돼