Agreed. I lost about 10 kg back to ~60 kg of the teen myself (now I'm 50). It took quite a lot of exercise but that was the easy part. The most difficult part was avoiding eating off hours apart from avoiding alcohol and sugar altogether. Now. Maintenance is surely easier.
On a side note, I keep exercising at least 2-3 hours per week and honestly I feel physically much better than I used to feel in my 30s.
In my experience, beer is the biggest one. I got gout young (which my weight didn't help, but mostly truly cursed genes), and beer was/is a huge trigger. Turns out excruciating pain is a hell of a motivator, so all my beer consumption was swapped out for equivalent alcohol amounts of liquor pretty much overnight. I lost a significant amount of weight over the next year.
On a side note, I keep exercising at least 2-3 hours per week and honestly I feel physically much better than I used to feel in my 30s.