Question

How someone not gain weight after overeating?

Metabolism. Genetics.

So I think for me it has to do with metabolism.

@dOnYa1386
It can be due to faster metabolism or more muscle mass, that is, the person may be able to burn more calories.
Also, there a few disorders that lead to extreme weight loss.

Fun fact: This is the 24th thread in the off-topic sub-forum titled "Question".

@CreativeThinking
Are you free enough to count them out?
~ All of those threads or most of the threads by (@)dOnYa1386 probably.

@Akbar2thegreat

lichess.org/forum/off-topic-discussion/question-24

The "24" at the end of the url indicates that this thread is the 24th topic with the same title ;)

#5 Do you have a problem with this issue? I did not know exactly what to call this topic. Obesity or thinness, overeating and ...

@CreativeThinking is right. Here you go @Akbar2thegreat :

lichess.org/forum/off-topic-discussion/question-24
lichess.org/forum/off-topic-discussion/question-23
lichess.org/forum/off-topic-discussion/question-22
lichess.org/forum/off-topic-discussion/question-21
lichess.org/forum/off-topic-discussion/question-20
lichess.org/forum/off-topic-discussion/question-19
lichess.org/forum/off-topic-discussion/question-18
lichess.org/forum/off-topic-discussion/question-17
lichess.org/forum/off-topic-discussion/question-16
lichess.org/forum/off-topic-discussion/question-15
lichess.org/forum/off-topic-discussion/question-14
lichess.org/forum/off-topic-discussion/question-13
lichess.org/forum/off-topic-discussion/question-12
lichess.org/forum/off-topic-discussion/question-11
lichess.org/forum/off-topic-discussion/question-10
lichess.org/forum/off-topic-discussion/question-9
lichess.org/forum/off-topic-discussion/question-8
lichess.org/forum/off-topic-discussion/question-7
lichess.org/forum/off-topic-discussion/question-6
lichess.org/forum/off-topic-discussion/question-5
lichess.org/forum/off-topic-discussion/question-4
lichess.org/forum/off-topic-discussion/question-3
lichess.org/forum/off-topic-discussion/question-2
lichess.org/forum/off-topic-discussion/question

@CreativeThinking #7
Oh, I did not know that!