what am I doing wrong

I would look up the sodium content of the foods you ate this weekend. After I eat out, I always "gain" five or so pounds just because fast food is high in sodium.

Edit: Sodium makes you retain water, thus increasing the number on the scale arbitrarily.

Its what you eat not how much.

read forks over knives bud. I opened my eyes.

I was over 320 and am same height. Am now at 270 in less than a year.

Friend me and you can see my food logs to see how i eat.

I agree with the sodium. Even in the healthiest choices restaurants add to flavor. A grilled salad I get on a regular basis has OVER a half of a day's sodium in it in one small salad. I believe all restaurants do this. And lunch meat too - when you feel you are getting a healthy sandwich at Subway instead of an unhealthy Big Mac at McDonalds, the sodium count is so high at Subway you will retain weight. And for me, it takes upwards of a week for it to go back down. Make sure you are tracking sodium in your tracker. Very discouraging but if you keep that in mind, it hopefully won't derail you. Good luck!

1700-2100 calories seems very low for a tall man with a lot of weight to lose. I've known big men to eat probably 1000 more than this and still lose weight. Go to the "in place of a road map" thread and use those instructions to calculate your ideal calorie intake to lose weight at a healthy rate.

Also, you need to ensure you track and measure all your calories accurately. Your numbers don't add up, if you were actually eating 1700-2100 calories you'd be seeing big drops in scale weight initially. Are you eyeballing/guestimating your measurements? If your measurements for food are over even by not that much, it can kill your deficit and people can be eating about a 1000 more calories a day than they think they are because of this.

Weighing food is the most accurate way, because a gram is a gram, an ounce is an ounce and so long as you're using reliable data for how many calories per gram or ounce there is in the food, it is accurate. Volume measurements are less accurate, because a cup measurement can vary and it's easy to overfill them or pack more food into the same volume by squashing it, etc, which means a cup measured by one person weighs more than a cup measured by someone else. Eyeballing/guestimating portion sizes is even less accurate, people tend to underestimate how much of any food they're eating, and so will be consuming quite a few more calories than they think they are. Personally, I found a kitchen scale to be a very worthwhile investment. It doesn't even have to be tricky or cumbersome: put the plate on the scale, zero it, then weigh each food item you put on the plate, zeroing it again between each one. Then log it directly onto MFP if you have the phone app, or write it down to log later on a laptop.

Interesting. If you really are eating that low, you aren't building muscle. I think you should be eating more even at your current size and with doing cardio like that. I see in your diary a lot of quick add calories. Are you sure those are accurate?

Are you sure you're logging accurately? You might be under-estimating your intake. We're all prone to doing that to some degree.

Also, don't worry about fluctuations. Your weight will always fluctuate up or down.

I'm 5'7" and eat that much daily, I agree, go check out in place of a roadmap. I don't think you are eating enough.

You might want to have your resting metabolic weight tested; that’s the number of calories your body burns at rest if you do nothing but sit around. I found out mine was just over 1300 calories/day, so if I don’t work out, I have to eat less than that to lose anything. So I set my goal at 1200, and if I exercise, I eat the exercise calories too (motivation for me to work out so I can eat more!). If you have a slow metabolism, you may need to have a lower calorie count as your base.

I never weigh on Mondays. I always "gain" a few lbs due to sodium from weekend goodies.

Try weighing on Wednesdays - I find I have flushed the sodium from my system and get a better idea of where I am at.