Our expert says:
NO, it's not possible to lose this much body fat, short of liposuction. I think that what has probably happened is an erroneous reading on the machine or using the methods you used to determine your value. I don't know exactly what you are using to work out this body fat - I assume it is the infrared machine in the gym, and if this is the case, then it's possible that there was something either faulty, or perhaps some light managed to slip in while you were taking the reading. I know from experience with the machine that this can sometimes happen, so you just have to be very careful to get the best accuracy possible. Also remember that you must do weight before body fat.
As for the increase in mass, that's quite possible to gain 2 kg over a period of weeks just from muscle, but I suspect that your case is more likely dietary. If you think about it, a can of coke, some juice, and perhaps a muffin is probably going to add about 1 to 2 kg to your body weight, and there's the difference. I'm speculating of course, but I have heard and know again from experience that weight readings will fluctuate wildly if the diet and procedures leading up to the measurement are not controlled. Therefore, the best way to weigh yourself is in the morning, or only once or twice a week following a day of eating the same meals and training the same way.
Hope this helps and good luck with the training.
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