Almost all foods are good sources of potassium, except the breads and grains. Especially good for you would be the fruits and vegetables (fresh, not from cans. Frozen is o.k.).

Supplements will never come close to the benefits of fresh whole foods and whats more, people tend to take too much in supplement form and this can lead to toxicity.

And yes, there is a potassium/sodium connection and they have an inverse effect on one another depending on if the food is processed.

For example, milk, alone, contains a good amount of potassium. But when you use it to make, let's say, instant pudding, the potassium gets processed out and the sodium level increases.

Roast beef contains potassium. But if it is processed into lunchmeat, a large amount of sodium replaces the potassium.

An ear of corn has loads of potassium. But if you buy in a can, creamed, then most of the potassium is replaced by the sodium again.

A fresh peach is almost 100% potassium. But if it's baked in a peach pie, like Sara Lee, etc... then it's only got 25% potassium, and 75% more sodium.

Get the picture.

Start eating fresh, whole foods and stay away from the processed and preserved.

Deficiency Symptoms: Irregular heartbeat, muscular weakness, glucose intolerance.