What does this '这样真的容易累成胖子' means? 这样真的容易累成胖子

"Getting easily tired like this is (making me) turn fat?"

I don't really know how to understand this sentence, please help me. Thanks.
这样真的容易累成胖子


Getting tired like this (making me) turn fat easily. 

这样真的容易... > ... like this really easily ...

累成胖子  > Getting tired makes fat.

verb + 成 + noun >  doing something (verb) then produces the result (noun)

BTW: What sort of tired thing making people fat other than thin?