That is a fair question. I am using a 4 point ORMON scale. It takes bio-impedence from hands and feet and has been pretty accurate for me so far in that it is consistent every single day. Every now and then it throws me a "zinger" number that doesn't make sense but mostly it is within .5% or less of any given number day by day. I am pretty confident in the number being right realatively speaking.
I also use pics and clothing fit. My clothes are definately tight and I can no longer fit in my size 3 jeans in fact and you can see the fat increase in my face (I actually like my face with more fat as it shows less age lines that way)
So I am positive that I am gaining at least some fat at this point. Since I am very anal about tracking everything I eat and monitoring data I feel comfortable with my assesment in that area too.
I suppose this fat gain will happen to anyone on a bulking program at some point in time. I am wondering if that it the time or single for the person doing the bulk to switch things up or if it is just expected to gain fat? I know for women it is really hard to not gain fat so perhaps for women it is different too? I don't know. This is all new to me.