I'm gaining weight like never before

Lewberry pie

Not a drug user but 33 now and weigh 95kg, I cut to make 90kg for comps but in the last few years it seems I have to basically eat nothing but veg and chicken then water manipulation to reach target weight.

Has anyone else had this as they got older, I mean not people who just got fat cause they were lazy, it's just like my body can gain muscle as well and is just not an effort, whereas before I had to eat loads to gain weight.