1. I think it means The one who is hungry don't care about the argument.

->I think it means that the one who is hungry doesn't care about the argument.

To me When I am hungry I only think about food.

For me,when I am hungry I only think about food.

2I think poor children don't take it or leave it at their pleasure in eating three meals a day.

->2. I think poor children don't take it or they leave it at their pleasure in eating three meals a day.

I feel really bad about it.

->I really feel bad about it.

Though everyone eat well, especially the children.

->Everyone should eat well especially children.

3. I don't understand.

->I don't understand.

What does this sentence mean?

->What does this sentence mean?

 In my case, after Exercise I used to be hungry.

->In my case, after exercising I am used to be hungry.

so I would eat food much.

->So, I would eat food much.

I think after exercise I would get hungry, I would eat food much.

->I think after exercising I would get hungry, I would eat food much.

4, I think It is need to exercise a good behavior or caution at formal meetings.

->I think it is needed to exercise in a good behavior or caution at formal meetings.

But I prefer to meet people at informal meeting.

->But I prefer to meet people at informal meeting.

 I really like its free atmosphere. because I can eat my fill.

->I really like free atmosphere because I can eat.