What's your height?

If your trying to go low carb you should probably stay away from plantains

We'll if you like you could just exercise a bit more then you can have your carbs
I went paleo for 4 months and exercised some days my carbs we're 30-75 some days I went 150 and more.
Lost about 20lbs

1/4 cup nuts shouldn't be a problem at all, so that doesn't sound like your problem. The only nuts I eat regularly are Mac nuts, they're high in fat and low in carbs. If you're consuming 85g for one meal you're likely going over your 100g Mark. With that said what works for me may not work for you so my best advice is to take advantage of the literature that's available. I believe we have a literature sticky in the forum. Hang in there, there's lots of support here.

ETA: recommended reading

There's a lot of contradicting information out there. You also mentioned that you're doing IF? It sounds like you have several things going on at once, so maybe transition one step at a time until you figure out the right eating plan for you. I actually had to up my fat intake (over 100g) in order to lose weight. Dairy is an issue for me, but some ppl can have it with no problem. Since you don't have much to lose it'll be a lot slower. I'm 5'5" and my goal weight is where you're at now.

How long have you been following the AIP plan?
I would think your body may still be healing and if you have been doing a lot of yo-yo dieting,your body could be clinging onto the weight,especially when you don't have much to lose..your body could also be happy where it is at 140..
If you are following AIP,why are you eating nuts?Nuts are inflammatory and are a big no no on an anti inflammatory diet.
It would be good to be able to see your actual food diary for people to be able to give you a better idea about what might be going wrong for you.

Okay, stop. You're over thinking things. Paleo isn't that hard, but you're treating it like all the other fad diets you've tried.

Paleo is not a fad diet. It is a lifestyle change. Remember that.

Now, what does that mean?

- Eat real food -- meats, vegetables, some fruits, some nuts, fats that are primarily monounsaturated or saturated fats (butter, avocado, coconut, etc)
- Eat the right amount of food -- don't try to starve yourself. Weight loss happens on Paleo, if you need it, because you're adequately nourished and you have healthy habits and a healthy relationship with food.
- Get enough of the right exercise -- Mark Sisson (Primal Blueprint) puts it well, I think: "move frequently at a slow pace, sprint and lift heavy things once in a while." In other words, maintain a good fitness foundation through walking a lot, and when you have the extra energy, do a short, high-intensity workout. Don't try to run marathons in an effort to be healthy and lose weight, because long endurance cardio routines are actually counterproductive.
- Focus on things other than the scale -- The point is to get healthy. So focus on that. When you're healthy (actually healthy, not some arbitrary number on the scale), your body will naturally regulate weight itself, just like it regulates body temperature, blood pressure, blood sugar, etc when healthy.

Throughout the posts, you said you were 140lb and 5'5". That height and weight puts your BMI at about 23.3, which is in the "normal" range of the scale (the 120 number puts you at a BMI of 20, which is one the lower end of "normal"). This suggests that you probably don't have much weight to lose, per se, and you're probably going to be better off changing your focus.

Why are you trying so much to lose weight? Let me guess, you want a bikini body, right? You want to get rid of the "flab" you have or think you have around your belly? You don't want to be "skinny fat"?

Starving yourself down to an arbitrary weight is the wrong way to achieve any of these goals.

That's right. It's not possible to get the body that just about every woman dreams of having through diet (and dieting) alone, and starving yourself to that point is even worse and counter to being healthy.

You want the bikini body? You want a flat belly and maybe some hint of abs? You want to look good naked?

Then stop worrying so much about the number on the scale, start eating real food to heal your body, and start a strength training routine.

Don't believe me? Then meet Staci -- http://www.nerdfitness.com/blog/2011/07/21/meet-staci-your-new-powerlifting-super-hero/

Read that. Then read it again to make sure it sinks in. Then go find and read the followup for good measure.

Why does that work? Because when you starve yourself down to a given weight, you are also losing muscle. Muscle is more metabolically active than fat, so when you lose muscle, your metabolism takes a bigger hit. This makes it harder to maintain a weight and harder to lose weight after you gain any back.

You fix that by maintaining and building muscle. You maintain and build muscle by maintaining a progressive strength training routine.

No, you will not turn into she-hulk.

No, you will not look like a man.

You will, if done right, turn into a lean, compact, powerhouse with the kind of body most women only dream about (because they don't know how to actually achieve it, or they are aware, but still have it in their heads that they will turn into she-hulk to actually do it). (And no, that won't happen even if "done wrong." If done wrong, you just won't get nearly the results you could get if you were doing it right.)

The juices that you drink may be your culprit, especially if the juices are high in sugar. You’ve gotten lots of useful information, and people here really want to help and have the best intentions, so I hope that it helps you gain a better understanding of this lifestyle.