If you want to become fitter, don't think "I want to lose 10kg of weight", think about finding a sport which you like and healthy food which you enjoy eating.
Your belly might not disappear 100%, but you will feel better, and you are in for the long run.
Specifically, eating sources of ecdysteroids like Spinach, Quinoa, Masal Root, etc. These are anabolic but do not have any androgenic side effects like conventional steroids.
The Popeye spinach meme is real.
I suppose if you come from a culture that eats insects you could also get a large amount of these compounds.
Eating spinach is generally good, but don't go overboard with it. For one, it's got the highest concentration of oxalic acid amongst green vegetables, and high concentrations of that can lead to kidney stones.
I don't know what would be considered too much spinach, personally I include it in my salads but not as the base (usually that's romaine for me), and sometimes Sautee some to go with eggs for breakfast, but I don't get it every grocery trip.
If you want to become fitter, don't think "I want to lose 10kg of weight", think about finding a sport which you like and healthy food which you enjoy eating.
Your belly might not disappear 100%, but you will feel better, and you are in for the long run.