So what did I do different this week...

So many reasons for a gain...
time of month
allergies
random water retention
new exercises - different muscle usage
more/less fiber than usual
slight changes in dietary habits
moon phase
astrological mumbo jumbo.
etc.

It seems completely random to me some days, but our bodies are not always the machine we like to think they are! Stick with it, and maybe you'll see a loss again next week!

Edit - By the way! Great job on the weight loss to date! Awesome!

zumba 1 hr can burn 1000 calories? wow that's too good to be true...

I'm totally serious about the moon phase. I find I'm up just following the full moon most months. Bizarre as it sounds! LOL.

Great job with the exercise, that's a totally awesome burn! You eating back 2/3 to 3/4 of those calories too?

I'll go with the random stuff we don't understand explanation. I've had stretches where I'm definitely burning more calories than I'm consuming, and yet didn't lose weight. But, I've also had stretches where I've lost more weight than can be explained by calorie deficits. Stuff happens, eventually it will even out.

zumba 1 hr can burn 1000 calories? wow that's too good to be true...

Depending on the weight and effort of the person, it's quite possible.

PS: Going through your diet, you are too high in proteins and not enough fat and carbs. I'd work to bring that in balance and see if that helps out.

Also, I'm seeing a lot of calories left "on the table" on your heavy-workout days. Feed the machine.

Just a couple of things to try, anyway...

This morning I had "gained" about 4 pounds since yesterday.. my TOM has started and I ate salty popcorn last night :P

yours could be:
* Too much sodium - go sweat it off (you had allot sunday and monday)
* Sore muscles storing water

Don't know how often you weight yourself, but you might want to give it a try to weight yourself every day for 2 weeks and keep a record in excel - see how it fluctuates. Tought me a bit at least

Yes another "why am I not losing weight topic" Not sure there is a specific answer out there but maybe some helpful people out there can help me a little. Since I have started MFP around 3 months ago I have lost 15 pounds (woohoo) starting at 246. I have been losing steadily every week, until now. I have been changing up my cardio since I started. I am now doing zumba, which has been busting my butt burning almost 1000 calories an hour according to my HRM and I feel it! I have been watching my sodium and calories. So this week all of a sudden my scale says ive gained over a pound, but my body fat % has not gone down and I have lost no inches in the last 30 days. What gives?

Just in looking over your last few days of diary my first suggestion would be to eat more vegies. Not lettuce, but other veggies, Also, try not to replace real protein with supplements, and cut back on the fruit which is high in sugar. Double check what a "serving" of fruit is (if you haven't alreayd) and limit yourself to 2-3 of fruit and only 2-3 of starches as well. (1 slice of bread is one serving, 1/2 cup pasta is one serving)

I plataued for 2 weeks and had to really look at how I was eating. I had gone away from eating veggies at every meal (potatos are not a veggie, neither are carrots, and while corn and peas are veggies, they are still starches so they don't count either. I know... it sucks )

ALSO, more excersise builds up fluids in your muscles that are intent on doing repair work. It is common to gain 2-4 pounds when starting or intesifying your work out routines to such a great extent.

Keep up the great work and don't get discouraged. once I changed my habits, within a couple of days I dropped 2 pounds!