Im 35 y.o 189cms in height and weight 107 kgs. Visceral fat type (No loose skin just big belly and waist, and water retention around face and rest of body).
Okay, so we have vastly different body types and I take daily L-thyroxin. Still, maybe something in my situation may apply. I'm 162 cms and 50.8kg, and I reached the age of 60 without extra weight. Suddenly and within a 2-month time frame, I gained 8 kg. I felt bloated and absolutely horrible - that was more than a 15% weight gain on my frame. Interestingly, it was mostly around my middle, like a paunch. I decided then to stop ignoring what a muscle therapist was telling me and to follow her advice - eliminate all meat and dairy. Really?!!
I considered myself to be a firm carnivore. Any time before when I tried a vegetarian lifestyle, I got really sick (lots of migraines). That and I considered cheese to be a gift from the Gods...
She explained how our bodies and gut biomes change with time, and that we did best when we changed our diet to reflect that. I was thoroughly tired of carrying the extra weight so I gave no-meat/no-dairy a try for a short time. The weight melted off quickly and surprisingly I didn't get any migraines. To prove I needed to stay off meat and dairy, I ate a little for a few days...and the weight quickly returned to my belly, so no more meat or dairy for me (and honestly, I don't miss them because I cook with lots of fresh herbs and spices).
This may or may not help you, but if it does...excellent! Good luck!