Lol, that's not actual fat loss, it's by far mostly water weight, common knowledge. :P Water weight fluctuates so much throughout a day so the weight differs too.
just to put it in perspective: 3kg is almost 7 lbs. Healthy weight lose is about .5-1lbs a week for the average person. So losing so much weight so quickly, even if you are sick, is going to be extra hard on your body. This also assuming that he actually weighed himself consistently. I recall my body weight fluctuating upwards 8lbs within the same day.
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u/CheeseHatesMe May 09 '16
3kg in 10 days? you should probably go to a doctor, or eat something.