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![enter image description here](https://i.stack.imgur.com/ps1SL.png)

From what i can tell, she is saying something along the lines of 'Even if you
have the whole cake, it's only 70 grams' but i'm unsure on the usage of 身につく
here. Unless my interpretation of the context is wrong of course.

[EDICT (from Nihongodict)](http://www.nihongodict.com/w/98250/minitsuku/)  
1. to master (e.g. a skill)  
2. to become accustomed to (e.g. a lifestyle)  
3. to acquire (e.g. a habit) 

[KOTOBANK](https://kotobank.jp/word/%E8%BA%AB%E3%81%AB%E4%BB%98%E3%81%8F-636921)  
１ 自分の所有となる。自分のものとして持つ。「悪銭―・かず」  
２ 知識・習慣・技術などが、自分自身のものとなる。「早寝早起きが―・く」
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2014-12-24T16:03:17.640
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word-choice
「身につく」 Usage of this word in this sentence
In 99% of the cases, 身に付く is used as an idiomatic phrase which is described in
EDIT. But that's not the case here in this manga.

This 身につく seems to mean something along the lines of "(70 g of sugar) becomes
part of your body (and add to your weight)". "Gaining 70 g (0.15 lbs) of
weight, at most, is not really a matter" is what she implies here. This is not
something you have to memorize, but it can be easily inferred by context.
CC BY-SA 3.0
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