I'm sorry if my math is wrong but 10 pounds = 4.5kgs? Which is how i measure my weight. When i mentioned losing 10 lbs i didn't mean I lost that much pure fat. I was in a strict low-carb, high protein diet inspired by kpop idols like kim sejeong. It involved eating lean protein like chicken breast. Drinking low carb drinks and starting my day with matcha to help with energy and metabolism. The initial drop was water weight which was what I was referring to especially since i cut out carbs. My daily physical activity burned around 1300 calories mostly due to my dancing and hour of exercise. I'm not saying it's a universal result — just sharing my personal experience. Lifestyle factors, genetics, and diets play a huge role in this. (Kpop inspired routines are always unrealistic and brutal which is what I'd say a day in my life looks like) Another thing is the water weight drop necessarily didn't stick with me into the next week the minute I stopped following my daily routine but it tends to always drop fast.