Why am I not getting enough Potassium?

According to google and this link, pretty easily.
http://www.healthaliciousness.com/articles/food-sources-of-potassium.php

I wouldn't worry about the sodium unless you have a relevant health condition like high blood pressure. As far as getting more potassium, a simple google search should help you find a list of high-potassium foods.

I don't know, how and what you eat. In general there is alot more sodium in ready made dishes or processed foods than in homecooked meals with fresh ingredients. The industry uses huge amounts of salt in there processing. So most people have high sodium / low potassium diet. From what I have read on the topic, this used to be different. And the human body actually needs more potassium than sodium.

I never ate alot of processed foods so my sodium is generally low. What I have noticed on my 1 1/2 years of tracking and analyzing the effect of certain foods on my weight, is that potassium is my key to retaining less water or getting rid of it again.

An example - pizza - grain carbs and high sodium, low potassium. If I eat pizza (even homemade, not as much fat and veggie toppings), I will retain 1kg of water over night! I like pizza, I eat pizza, I know what the scale will read the next morning ;-) If I eat a high fat / high cal / higher sodium melted cheese dish called raclette with steamed potatoes and drink wine with it, no gain in the morning. (Assumption - I didn't go over my cals on that given day)

Why! Because the steamed potatoes are low cal, high potassium! I know this is all empirical, but I have seen this phenomenon happen many times. So I then started tracking potassium in my macros. Since I have been keeping my potassium higher than my sodium, I've had less problems with water retention. Or I can get rid of it quicker after a high sodium day.

There are also several foods you can integrate into your diet with high potassium levels. Some are high cal, but there are lots of veggies with relatively low cals and high potassium levels. Google some food potassium levels and you will find some lists on the topic.

My staples are bananas, cauliflower, tomato paste, potatoes, many melon types are good, in general lots of fresh veggies. Potassium is very water soluble. So if your goal is potassium in your diet - fry, bake, steam, don't boil.

The potassium supplements you can buy OTC are VERY VERY VERY low potency. You would need to take 40 pills to reach 4,000 mg of potassium!!! If you need to take a supplement, then to get one that will make any difference, it needs to by by prescription only.

In the early months following my weight loss surgery while my stomach was still healing, I struggled sometimes to get adequate potassium from foods alone. I drank a vitamin water zero to help with potassium levels. The "Revive" flavor of Vitamin Water has 880 mg of potassium which was just enough to supplement the potassium I was getting from foods. I also struggle with getting enough potassium when I go low carb as some of the most potassium rich foods are fruits and potatoes! Here's some great lower-carb potassium sources

4oz flounder- 600+ mg of potassium
1 cup cooked dark leafy greens- 800+ mg of potassium
1 cup nonfat plain yogurt- 625 mg potassium
1 avocado-900-1,000 mg of potassium
1 scoop isopure protein powder- 380 mg of potassium
Also most meats will give you 300-400 mg in a 3 ounce serving.
1 cup portabella mushrooms 400 mg potassium.

The potassium supplements you can buy OTC are VERY VERY VERY low potency. You would need to take 40 pills to reach 4,000 mg of potassium!!! If you need to take a supplement, then to get one that will make any difference, it needs to by by prescription only.

This is true, I was having really bad cramps and my personal trainer suggested I take in more potassium, so went looking for supplements. But everything I saw, said 1-3% of the daily requirement..huh? So I asked the pharmacist about this, seems potassim is highly toxic. So one could easily poison someone with excess potassium, so that's why supplements are so low. So real food is your best bet as stated above

So I keep on getting too much sodium and not enough potassium! How can I reverse this? I do not want to take a potassium supplement unless absolutely necessary. Any advice?

The MFP app is not an accurate way to monitor potassium. Food labelling does not legally have to have this listed and the majority of database entries will either have it missing or wrong due to this. If you have any concerns go see your doctor in all likelihood though your potassium is perfectly normal

Sodium is more abundant in processed foods, which means anything canned or prepared you're going to run into this. Unless you're having problems with water retention, I wouldn't overly worry about it.

I've been tracking potassium for several years. The good news is that meat is high in potassium.
If I want to up my K levels, I make a protein powder shake with coconut water or have a cup of V8.
Tomatoes are high in K, as are potatoes and most veggies. Eat a pile of mushrooms. Low cal.
Bananas are a poor choice actually if you don't want to add cals to a meal. I'd rather eat a piece of meat and get the protein as well. Squash is another good one. Fairly low cal and high in K and fibre.
I make all my own entries in the database and track potassium. You can check here:

http://ndb.nal.usda.gov/ndb/search/list