eating during the 15's

I read that the 15's are not for hypertrophy, but for preparing the muscles and joints for the heavy weights that come later.

I assume that I should not be eating surplus during the 15's, or I'll just gain fat. Is this correct?
 
Assuming you have done a correct SD you'll be able to gain on the 15's. I did 15's in one of my cycles and got results when in a surplus.
 
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