How do I increase my appetite?

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So my parents cook Chinese dishes pretty much everyday.

On Tuesday and Wednesdays, I come home around 8:30pm, and that's when I start eating. My family usually starts eating at like 7 and finishes by 7:30. When I come home late, my parents portion some dishes for me and usually covers it with a lid or plastic wrap or something.

For some reason, when I come home late, althoughI haven't eaten, I just don't feel like eating that food. I can eat anything else all right, but just not that. To be honest my mom is a pretty bad cook, but by the time I start eating it's really bland. If I eat at the usual time, I can pretty much eat until I'm full. When I come home late, I can eat, but I don't want to eat even though I know I could.

Help me out here /adv/, I need my nutrients if I wanna grow into a big strong boy. What do I do?