Hmm, well from what I know the lethal does of potassium is 2500mg. So you would have to eat about 318-400 or so bananas in 30 seconds to overdoes. Otherwise it is impossible to overdose on potassium from bananas because your kidneys extract all the potassium over time. Toxicity or death due to potassium poisoning is usually prevented because of the vomiting reflex if that where to even come to that point. It also would take you a whole month of eating nothing but bananas to develop a deficiency of any kind. You or your parents don't need to worry. (:
Here's a video. https://www.youtube.com/watch?v=fJueUbQVjLU
Thanks for that Audra :)
From my own research just now, I found out that the recommended amount of potassium per day is 2000mg which is about 4/5 bananas. Plus potatoes have about the same amount of potassium as bananas, but it dissipates when cooked.
Personally I would be more worried about the amount of salt they are eating on a SAD diet.
The Adequate Intake (AI; analogous to the RDA) for potassium is 4700 mg for adult men and women.
In terms of toxicity, there is no Tolerable Upper Limit (UL) for potassium, meaning there isn't enough evidence to determine the toxicity threshold. There has not been any documented evidence of potassium overdose (hyperkalemia) from food. But potassium overdose from supplements is possible.
Here is the full stance from the DRI committee of the Institute of Medicine:
"None documented from food alone; however, potassium from supplements or salt substitutes can result in hyperkalemia and possibly sudden death if excess is consumed by individuals with chronic renal insufficiency (kidney disease) or diabetes."
And the reason why only these people at at-risk from supplemental overdose is because in an average person, about 90% of potassium is excreted by the kidneys, and those with kidney disease or diabetes (often accompanied by renal complications) have trouble excreting the excess potassium from potassium supplements.
Hope this helps!
Yeah, you really don't need to worry about getting too much potassium on this diet - a lot of our members eat up to 60 bananas a day and are all healthy and fit! :)