Sick, Eating under 1200 calories - but stopped losing?

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Hi - I just started the plan and everything was going well - loosing weight at a regular rate. Then, a few days in, I ate something that I suspect gave me food poisioning - so was unable to eat the full 1200 for a few days (3). But did drink water, gingerale and ate banana and soda crackers. What I don't understand is why my weight loss stopped (and has not recovered to the regular rate of loss) since getting sick

Does anyone know why that would have happened? Doesn't make sense to me