Hi Pat, welcome!
398669 wrote:The daily requirment for potassium is about 4 grams
There are no official potassium RDAs.
The question of what is the optimal intake of potassium is debated.
Yes, in 2004 the Institute of Medicine recommended 4 g daily, but Americans on average consume about 2 g daily,
which would make them formally deficient, and equally so, european intake is commonly officially insufficient,
and yet clear cases of potassium deficiency are rare.
Why?
The uptake ratio of minerals and trace elements is not fixed, but is adjusted in response to availability.
The uptake ratio of calcium, for example, may vary from 8 to 80%.
This means that if you consume a lot of potassium, your uptake ratio will be much lower compared to when consuming little potassium.
Potassium is essential in all living cells, and therefore all plants / animals contain it.
Particularly plant cells are high in potassium, and especially fruits.
and one banana has about 2 grams
1 small banana contains about 400 mg potassium
1 medium banana contains about 460 mg potassium
1 large banana contains about 540 mg potassium
so it seemes to me that 9 would be too much.
No, one can safely consume dozens of bananas daily, though im pretty sure your appetite for bananas will diminish
As far as i know, there are no known cases of potassium overload.
Of course, this is not at all true for all minerals / trace elements.