Reasons For Stomach To Stick Out After Eating Defining Muscles And Flattening Stomach?

Defining muscles and flattening stomach? - reasons for stomach to stick out after eating

Ive been working for about half a year (15, but not until puberty enough, so I do not cry, I am still) too young. I do a lot of work and a healthy diet. I, cardiovascular, whole belly. But for some reason, my stomach and my arms keep som fat. Is there a way to resolve this problem, or am I determine how thick?