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It's unlikely that you lost 7 genuine pounds in two days. Even if you ate nothing, burning approximately 25,000 calories in two days just not going to happen. If you saw the scale move 7 pounds in two days it was probably a shift in water balance. For example, you might have gone from mild over-hydration to mild de-hydration.
If you're asking from the other side, whether 7 pounds in two days a reasonable expectation or goal, the answer is no.