Does a diet high in fiber really cure constipation?!

For some yes, but it's useless unless you are also drinking lots of water. There are also other reasons you may be constipated. For me it was because I was lying down in bed on my laptop all the time. Once I sat up in a chair instead most of the time my constipation was cured. Fiber and water helped but it didn't completely cure it until I did that.

If you eat fiber rich foods and your symptoms are not relieved, you may try a stool softener or probiotics.

to some extant it is true you avoid maida mavu items like parotta you take bananas in the night regularly that will ease you

Yes it does.