Salt seems to be my main culprit, but it can be general water retention, the amount of food still in your system, gaining muscle mass (700 calories of muscle weighs 1 pound vs 3500 calories for fat), etc. Consumer scales are usually only rated for 99% accuracy which for me means the scale might be plus or minus 3 lbs from my actual weight.
Hope I'm not hijacking your diary, but this was my longest plateau to date, it was 8 days between new lows (Sept 2 - Sept 10) and 12 days between when I first hit 297 and when I finally broke through for good (Aug 27 - September 9)
Date...............Weight....BF%...Calories...Sodium
August 27.........
297.0.....45.0%.....1316.....
2823
August 28.........
298.8.....
43.5%.....1310.....1429
August 29.........298.0.....43.5%.....1328.....2176
August 30.........
296.0.....
43.8%.....1395.....
2863
August 31.........
296.2.....43.5%.....1358.....2289
September 1.....
295.0....43.5%.....1341.....
3297
September 2.....
293.8....
43.0%.....1595.....
3840
September 3.....
295.0....43.0%.....1529.....
3820
September 4.....
295.2....
42.0%.....1401.....
2800
September 5.....293.8....
43.3%.....1521.....
4379
September 6.....
294.6....
43.8%.....1514.....
3292
September 7.....
297.0....
44.5%.....
1981.....
6508
September 8.....
297.6....43.5%.....1251.....
2793
September 9.....294.4....
44.8%.....1322.....1725
September 10...
292.2....
42.7%.....1386.....2500
September 11...292.2....
43.0%.....1335.....
3821
Swings like that are I now update my diary once a week with a weekly average weight rather than that morning's weight. When you step back you can see the big picture trend is pretty steady overall:
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