When will I lose weight?

I was wondering when will I start losing weight ? I bike 70 miles a week on my stationary bike But it does not look like its doing anything. I have been not eating all that junk except for once a week.
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p.s I am not someone who is like 120-150 who wants to lose more weight. I am someone who is not in the healthy range.
When will I lose weight?
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