grammar - sometimes だけ gets mildly confusing..

If someone says それだけ、食べないでください, does it mean:

1. 
   

   Please don't eat only that [eat other things too!]

   
   

   or

   
   


2. 
   

   [You can eat anything you like but] only that, please don't eat it.

   
   

---

What about それだけ、たべてください? Does it mean:

1. 
   

   Please eat only that [and don't eat anything else].

   
   

   or

   
   


2. 
   

   [I don't really care if you eat anything else but] only that, please eat it.

   
   

Answer

This is really ambiguous and depends on how it's stressed/paused:

それだけ食べないでください。
"Please don't eat only that."

それだけ、食べないでください。
"Please don't eat that. (Eat anything else.)"

The actual sentence seems to have been this though:

それだけは、食べないでください。

　　　　^

That marks それだけ as the topic, which clearly means "Please don't eat that."