18-day plateau then 3.2 lb overnight drop — water or fat?

2026-09-16 11944 views 63 posts

I’m 5 ft 6, started at 186.4 eight weeks ago, now 171.8. Eating around 1600 cal, 10k steps, lifting 3x/week. Weight sat at 174.6 for 18 days. Yesterday I woke up at 171.4 after a normal dinner.

Fasting glucose went from 104 to 92 over two months, A1c was 5.6 at my last check. Is this the whoosh thing, or is my scale gaslighting me? Should I trust the new low or stick to weekly averages?

Not gaslighting. I’ve had the same thing after a high-sodium weekend. Scale held, then dropped 2.8 lb two days later. Weekly average is the only sane metric.

Did you change training volume or carbs around day 12? Sore muscles hold water. For me lifting 3x keeps the scale flat for 10-14 days, then whoosh.

A1c 5.6 to what? You only gave the last one. If fasting glucose dropped 12 points, that’s a solid trend.

Common surprise: the whoosh is real enough. The scale parks at 172.9 for 16 days, then 169.6 the morning after a rest day. No special changes.

I agree on weekly averages, but I still log the daily low. The 171.4 is real for that morning; the fat loss is the trend, not the single drop. My scale does this after every long stall. Boring consistency wins.

I added a second walk and slept better around day 12. Not sure if that did it, but my sore legs finally stopped holding water. Woke up lighter after a rest day. Feels like timing, not magic.

The fasting glucose drop looks like a solid trend. I’d keep watching the weekly scale average and how clothes fit. One morning is just one snapshot. The trend is what pays rent.

Whoosh goblin visited. Accept the gift, don’t marry it.

I hate the flat stretches. I once stopped weighing daily and gained four pounds in a month. Now I weigh and average. The 18-day stall felt endless, but my waist was shrinking. The scale just caught up.

Sodium gets me every time. A restaurant meal shows +3 lb, then three days later I’m down 3.5. I only trust the seven-day average after that. The overnight drop is just the water finally leaving.

Lifting three times a week does the same to me. Sore quads hold water. I take a rest day, drink extra, and whoosh. It’s not magic, just timing and recovery.

Trust it as data, not destiny. Log it, keep doing the boring stuff. If next week’s average is lower, that’s the real win. The new low is nice, but the trend is the trophy.

Daily weigher here — I screenshot every morning number and only judge the 7-day average. Mine sat between 173.0 and 173.4 for 19 days, then the average slid 1.5 lb over five days with zero chane in what I ate.

That overnight whoosh usually means your body finally let go of water it was holding, not 3 lb of fat in one night. Trust the new low as a data point, not a verdict.

Mine gaslit me for three weeks — scale stuck at 176.2 while my jeans went from tight in the thighs to needing a belt on the same notch I wore 10 lb heavier. I started measuring my waist at the navel every Sunday, and it dropped 1.25 inches during that flat stretch.

If your tape and your clothes are moving, the whoosh is real, the scale just caught up a few weeks late.

Do the math on that drop: 3.2 lb of actual fat is roughly 11,000 calories of deficit, which you did not do in one night — so almost all of it is water, glycogen, and whatever was still sitting in your gut. That doesn't make it fake, though.

I held at 179-181 for 17 days, then dropped 2.8 lb overnight after a day where I slept 8 hours, drank 3 liters of water, and ate a low-sodium dinner (chicken, rice, roasted veggies) instead of my usual takeout.

The turnaround for me was realizing my plateau wasn't stalled fat loss, it was cortisol and salt masking it, and the drop showed up once sleep and sodium normalized. Log the new low but don't crown it yet — watch whether your 7-day average holds it for two full weeks.

Heads up that your 3x lifting may be feeding the plateau itself — muscle repair pulls in water, and I routinely sit 1.5-2 lb heavier for two or three days ater a heavy leg session. I added a 20-minute walk after dinner and shed about a pound of that puffiness without changing anything else.

So those 18 flat days probably had fat loss happening underneath the inflammation, and the whoosh is just the water finally clearing.

Six weeks in, I quit the daily scale and started measuring my waist every Sunday — down 2.5 inches while the scale sat flat for 12 days straight. The weird part? My biggest overnight drop came after a pizza-and-beer night, not a clean day. Water does whatever it wants; the tape measure just kept moving.

Sleep is the invisible one for me — 8 solid hours and I'm down 2 lb, a 5-hour night and I'm up 1.5.

Weekends are my plateau factory: Friday to Sunday I'm up 3 lb of food volume, gone by Wednesday.