Nikki May there are so many questions I'd ask you to try & work out what might be going wrong for you, I'll start with just a few.
Are you restricted with food when you feast (through intollerences etc)?
Aprox what would a normal days calorie intake be (lower, normal, higher than RDA)?
How are you consuming your allowance on fast days (spread out or all at once)?
I am gluten intolerant so restricted there, I eat around 2000 on my feast days I would say. On my fast days I don't eat through the day just one meal in the evening. I can't exercise at all so not sure if that makes a difference.
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