BomberKen, I am pretty sure now that the cause was what exposed. I increased carbs because I do not wish to loose weight, libido returned. What happened most probably that in my insulin sensitive case, insulin dropped, shbg soared, total T remained the same hence bioavailable T decreased taking down libido.what happens is that after some time total T increases, shbg remains constant hence bioavailable T returns to previous or close to previous values. An extremely interesting mechanism.