I will chime in
Why do pregnant women gain a lot of weight even if they keep their calories the same?
Because it isn’t about just calories in. It’s also about hormonal changes and calories out too.
This is why IIFYM is a dumb idea and didn’t work. The people who pushed that diet 12 years ago have been proven wrong
Tren throws off calories out because it’s a sponge

and it also affects metabolism/hormones. There are people who ate nothing but junk on it who shredded for that reason. I dont recommend doing that because you’re doing damage in your body that you’re not seeing but that answers your question.