I don't know how to differentiate between these 2 meanings of 控える:

>   5. 〔止める，見合わせる〕 勝手な発言は **控えて** ください  
>  Please refrain from speaking without permission.
>
>   6. 〔少なめにする〕塩分を **控え** なさい  
>  Cut down on your intake of salt.
>
>

In this sentence:

> 少なくともそれまではお酒とたばこは **控えて** もらえますか？

How do we know if it's limiting or stopping completely?
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2018-12-06T23:20:41.990
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meaning verbs
Trouble with the ambiguous verb 控える
控える basically means cutting down on or refraining from, but to a reasonable
extent rather than stopping completely. In the case of 塩分, it's impossible to
completely remove salt from your food in the first place. In the case of
少なくともそれまではお酒とたばこは控える, most people would probably try to stop using/abstain
from them completely, but some people may just cut back. If a physician
seriously wants a patient to stop smoking completely, they would unambiguously
say 禁煙してください or タバコは止めてください.
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In your case, the actually implied prohibition level is still not clear
without broader context. But if I'm allowed to guess from that piece, I tend
to think you are advised to stop.

Generally speaking, 控える is a polite way to tell people that something is
_strongly discouraged_ , i.e. the less the better, but you might do it to a
degree that doesn't get much in the way of the goal. This verb has another
meaning "wait on someone at the side", so you can see that you are expected to
do nothing, or at least act without being obstructive. For example, imagine if
the chair says 勝手な発言は控えてください in the hearing of the entire conference room, so
it practically equals "don't do".

* * *

**PS**

According to [大辞泉](https://dictionary.goo.ne.jp/jn/183264/meaning/m0u/):

> **２**  
>  ㋐度を越さないように、分量・度数などを少なめにおさえる。節制する。「酒を―・える」「塩分を―・える」  
>  ㋑自制や配慮をして、それをやめておく。見合わせる。「外出を―・える」「発言を―・える」

> [補説] **2**
> ㋐㋑について、「抜歯後はお酒を控えてください」とあった場合、㋐の「少なければ飲んでもいい」の意味ではなく、㋑の「自制して飲まない」の意味ととらえるのが妥当であろう。「アルコールを摂取した場合は運転を控えてください」は、明らかに㋑の意味である。

In my experience, 控える in medical advice lingo is "never" in most cases. If
they want to tell you to reduce the amount, I feel they will say 控えめにしてください.
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