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11 comments

Don’t Eat Those Green Potatoes!

Posted January 06, 2009 12:01 AM by Jaxy

There are many ways to enjoy potatoes: fried, mashed, baked, etc. Potatoes get a bad reputation from dieters because of its starch content and high classification on the glycemic index. Although there are many nutritional benefits of potatoes, will these pros be able to outweigh the cons?

While it is undeniable that potatoes contain a significant amount of carbohydrates, the predominant form is starch. A significant portion of this starch is composed of a form called "resistant starch". Resistant starch is similar to fiber in its health benefits. It can improve glucose tolerance, lower triglyceride concentrations, and protect against colon cancer. The amount of resistant starch found in a potato can increase or decrease depending on how it is prepared. A cooked potato will contain about 7% resistant starch; once it is cooled, the potato contains about 13%. This suggests that cooking and then cooling potatoes will dramatically increase the amount of resistant starch.

Potatoes contain nutrients that are essential for a healthy human diet. Not to mention the added fiber associated with eating potatoes with the skin, which equals the amount found in many whole grain cereals, breads, and pastas. But don't believe for one second that eating just the skin of the potato will give you all of the nutrients. While approximately half of the fiber is found in the skin, more than half of the nutrients are found within the potato itself. Potatoes are generally considered high on the glycemic index, but it can change depending on preparation methods, type of potato, origin of growth, and the toppings.

There is an overwhelming con to this potato puzzle though. Potatoes contain toxic compounds, called glycoalkaloids, which are meant to protect the plant from predators. This toxin is usually concentrated in the leaves, stems, and sprouts. Tubers have the highest concentration of the toxin right under the skin and can increase due to light exposure, physical damage, and age. Poisoning from potatoes rarely occurs because cooking at high temperatures will destroy most of the toxin. In wild potatoes, the concentration of glycoalkaloid will produce toxic effects in humans. The good news is that potato breeders who develop new potato varieties test for this toxin. A visual indicator of high toxin levels is if the potato is green. Even though light exposure causes greening, glycoalkaloid levels and greening can occur independently. Being safe never hurt anybody.

While potatoes can contain harmful levels of toxins, unless you eat a green potato or drink potato-leaf tea, you will not get potato-source poisoning. Large consumptions of potato in one sitting may not be healthy for your glycemic index, but potatoes are a very healthy part of any meal in moderation.

Resources:

http://en.wikipedia.org/wiki/Potato

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#1

Re: Don’t Eat Those Green Potatoes!

01/06/2009 8:44 AM

From source (the wiki http://en.wikipedia.org/wiki/Potato )

The US National Toxicology Program suggests that the average American consumes at most 12.5 mg/day of solanine from potatoes (the toxic dose is actually several times this, depending on body weight). Dr. Douglas L. Holt, the State Extension Specialist for Food Safety at the University of Missouri, notes that no reported cases of potato-source solanine poisoning have occurred in the U.S. in the last 50 years and most cases involved eating green potatoes or drinking potato-leaf tea.

Solanine is also found in other plants, mainly in the mostly deadly nightshade family, which includes a minority of edible plants including the potato and the tomato, and other typically more dangerous plants like tobacco. This poison affects the nervous system causing weakness and confusion.

Very interesting! I had no idead that potatoes, especially wild, had a similar toxin ot nightshade!

Also curious to me is that many 'traditional' things people do: e.g. cooking and then cooling the potato, are beneficial. It seems we run across things like this quite a bit. The cooking helps lower the toxins and increase the starch benefit. (though I'm sure that not ALL things fall into this category).

Indeed; I think I saw a similar comment before: Everything seems to be toxic these days

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#2
In reply to #1

Re: Don’t Eat Those Green Potatoes!

01/06/2009 8:53 AM

Thank you for your comment. I never knew that potatoes could be dangerous! People have been eating potatoes for generations, who knew that they can be bad for you. It seems that potatoes are toxic on their own accord, however, and not because of human intervention.

I am beginning to wonder if it is just a lucky guess that by tradition we cook potatoes and then cool them!

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#4
In reply to #2

Re: Don’t Eat Those Green Potatoes!

01/07/2009 12:31 AM

Probably it is just because the don't taste so good raw!

Rhubarb is another plant where the stalk is tasty but the leaves are poisonous.

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#3

Re: Don’t Eat Those Green Potatoes!

01/06/2009 9:05 AM

Along the same lines do a quick search on "poke salad", once popular in the southern states of the US.

Very particular requirements for cooking (boil, pour off water as it is toxic, reboil, eat) make one wonder; who was the dumb-bunny that stepped over his dead relative to re-boil and try this toxic green?

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#5

Re: Don’t Eat Those Green Potatoes!

01/07/2009 4:03 AM

How come the potatoes stored in cold storage turn sweet and loose original taste?.

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#6
In reply to #5

Re: Don’t Eat Those Green Potatoes!

01/07/2009 8:57 AM

...that was an apple you were eating. Turn on the light next time!

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#7

Re: Don’t Eat Those Green Potatoes!

01/07/2009 10:13 AM

I think I like potatoes or as I like to say taters in just about any way I have ever tried them. One of my aunts used to eat them raw after they were peeled and although they weren't particularity bad tasting I never really got into eating them this way. I never knew they had a toxic side but then I don't think I have ever ate a potato stalk or leaf. I have grown the red potatoes and the bigger baking type. When I was a boy my dad would store them under the house on a bed of straw and he used to lime them and cover them over with straw and they would last a really long time that way. He always told me a dark, cool and dry storage area was the trick to making them last.

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#8

Re: Don’t Eat Those Green Potatoes!

01/07/2009 10:32 AM

My grandfather is a big potato fan - he grew up on a farm where they raised their own farm, and also had horses to plow the fields...

Anyway even in modern day he still grows several rows of potatoes in his garden and stores them in big bags in his cellar. They keep most of the winter. If something happens to his crop he buys a 50 pound bag or two from a farmer he knows. You have to watch out for any rotten/spoiled ones because they will ruin the rest. And yes, it's gross when they turn green! The long eyes are gross too...

My favorite way to eat them is peeled and cut into thin strips and fried in oil - yummy homemade french fries!

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#9

Re: Don’t Eat Those Green Potatoes!

01/07/2009 10:45 AM

For Dog owners

Cooked potato can be given to dogs, most love it. But some dogs also like raw potatoes, which is really bad for them I am told, prevent them eating them raw.....

Now I know why they are dangerous, many thanks for the infos.....

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#10

Re: Don’t Eat Those Green Potatoes!

02/25/2009 9:14 PM

Hi Jaxy! Thought I'd take a peek at your Blog & see what's cookin' in your neck of the woods (sans green potatoes!)

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#11
In reply to #10

Re: Don’t Eat Those Green Potatoes!

02/26/2009 11:09 AM

I appreciate it! Although right now you are missing a heated discussion about tofu!

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Users who posted comments:

Andy Germany (1); edignan (1); gdevine (1); Jaxy (2); JCase (1); pipewelder (1); rcapper (1); SavvyExacta (1); suresh sharma (1); user-deleted-13 (1)

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