@HHR is on track 800 is low male or female and it sounds like you are really not taking into account macro nutrients at all why are important.
You might feel good now but when you are in pursuit of something your will can override what is best for you.
If that's all you are eating it won't be sustainable for long. Additionally you could do some damage to your body that might not be immediately evident and hard to fix long term.
30 pounds in loss is not easy to achieve in general let alone in a way that looks good to you.