Gains and negative energy balance
Along with the Vit C thing, I think the relative energy balance at the time of active PEing may have an impact on gains. As with the Vit C thing, I believe a negative energy balance, loss of body weight, may have a positive impact on gains, whereas a positive energy balance, gaining weight, might have a negative impact on gains.
My experience: After gaining some with PE while in a neutral energy balance state, I decided to lose weight to go along with my ‘new’ penis. This seemed to lead to more gains. After loosing weight and gaining more penis for several months, my energy intake returned more to normal, and about the same time, penis gains began to slow. Very well could be coincidence.