I guess if you cut out refined sugars and processed foods that would account for the losses. I gain weight when stressed so following my breast surgery /recon I gained about 5 kg then on chemo AC gained another 5...then on taxol gained another 9. Although I managed some regular exercise my incidental exercise was much less and I couldn't stand vegetables. I lived on toasted sandwiches on AC. I craved salty foods and had far too many milky coffees. Steroids didn't help much either. As long as you are eating regular healthy foods with plenty of protein and small amounts of carbs I wouldn't stress. Thankfully I love veggies again and have lost 6kg since finishing chemo 8 weeks ago. Goodluck with your next part of chemo. Kath x