Depending on how many carbs you were eating beforehand, it can be, as some carby food, however well within your calorie budget you are, can hold onto water for some people; for me.
Unless you ate 7,000 calories fewer than you need on those days, it cannot be 2lbs of fat; but 2lbs of excess water is 2lbs of weight your joints don't need the strain of bearing, so it's all good.
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