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1 - you are dehydrated from electrolyte deficiency, that’s why your body is grasping for every drop of water it can.
2 - read the sticky
3 - removed for rule 2 - extended fasting without electrolytes
4 - banned because you have anorexia and BED
The good news is your body has not somehow created extra tissue out of nothing, that would defy physical law. It’s certainly water weight— for whatever reason your body is holding more water than when you started the fast, enough that it’s outweighed the fat loss. Could be related to the antibiotics but I’m not sure. If you feel fine otherwise I wouldn’t worry.