I should add you can still eat your jerky and trail mix if you like, if you're only eating around 1400 calories a day it's going to be hard to get bad levels of sodium
I disagree with this. A serving of beef jerky has nearly the full daily allowance of sodium, depending on the brand. Jerky is salt and smoke cured. It's nothing BUT sodium and protein.
I eat 1600 cals a day and it's VERY easy for me to exceed 2500g of sodium - and I don't eat a whole lot of processed food. One snack of jerky, or one packaged cheese stick, or anything like that can shoot up sodium values.
As far as weight loss slowing - what no one else has pointed out is this: It's simply mathematical fact.
When you weigh 200 lbs and you cut your calories by 20% (using these numbers as an example), you're probably cutting back around 700 calories per day. If you do the math, that equals about a 1.5 lbs per week being lost.
When you weigh 160 lbs and you cut your calories by 20%, you're probably cutting back maybe 450 calories per day. Doing the math, that equates to a little less than 1.0 lbs per week being lost.
Mathematically you cannot continue losing at the same rate you lose when you weigh more unless you cut your calories back to an unhealthy level. That's where that 1% body weight rate comes in.
When you weigh 200 lbs, your 1% loss = 2 lb per week.
When you weigh 160 lbs, your 1% loss = 1.6 lb per week.
Simple math.
So yes, those last 10 lbs DO take longer and are harder to achieve ... because the closer you get to a healthy goal body weight, the less fat and weight you have to shed ... and the more you have to do things like step up exercise and be extremely accurate with your calories.
And .. on top of all of that ... when you weigh 200 lbs and you slip up once in a while or forget to log 100 or 200 calories, or indulge in a candy bar or whatever ... it's not that big a deal. But when you slip up at a lower weight, sometimes 100 calories can have a big influence.
So yes ... all of the above. Mathematical fact. Sodium. Accuracy. And just plain biology. Yes.