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Vitamin A toxicity from beta-carotene? - New research

Answered on August 19, 2014
Created August 16, 2013 at 3:08 PM

Hi Guys,

I wanted to know if there is ANY chance of beta-carotene from plant sources?

I eat about 2 sweet potatoes, plus carrots per day.

Everything I've seen on this seems to say there's no problem with this as any excess beta-carotene is excreted by the body once it has enough.

However this recent study seems to say otherwise,

http://researchnews.osu.edu/archive/betacarotene.htm

I don't smoke but recently entered a open air building site where asbestos was present but I didn't go within a 3 meter range of it.

Has anyone got any thoughts on this? Can I safely continue to consume beta-carotene foods.

Thanks for you answers

Ed71ab1c75c6a9bd217a599db0a3e117

(25477)

on August 16, 2013
at 09:17 PM

hen you photoperiod is altered so is your Vitamin A cycle. http://www.jackkruse.com/cpc-6-pseudotumor-cerebri/

F823371a5c530abf36eab29b7ce3ee2a

(50)

on August 16, 2013
at 05:19 PM

Thanks a lot, I do notice some itching when I eat too many, or any other starch, usually combined with lack of sleep. Would love to cut down but I just drop too much weight without carbs. I am already thin and have tried adding more fat too boost cals but doesn't seem to work.

F823371a5c530abf36eab29b7ce3ee2a

(50)

on August 16, 2013
at 05:17 PM

Thanks that's a great answer. I think I just solved the problem. I am gonna switch to white sweet potatoes that have far less beta-carotene.Then I can also add in some liver, etc.

9b0a4701e373d4dd13831cfb9b13f42d

(1677)

on August 16, 2013
at 03:40 PM

Uh oh, "2 sweet potatoes, plus carrots per day." Hope all of your affairs are in order. LOL

  • F823371a5c530abf36eab29b7ce3ee2a

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4 Answers

1
62fafa8cb15af7c562fa8c270f7b6174

on August 16, 2013
at 08:31 PM

Look in the mirror. If your nose is turning orange, put down that carrot.

As a small child, a family member used to eat so many carrots she'd have this problem.

1
F9cb5745815f70ca8214bb73b0a06bae

(154)

on August 16, 2013
at 03:51 PM

I wouldn't worry about eating foods that contain B-carotene. Its a natural substance that works together with many many other vitamins/minerals to benefit your health. Just don't start supplementing B-carotene (I don't even know if they even do that anymore, but its bad on its own). There is virtually no way to have vitamin A toxicity from beta-carotene, I'm pretty sure your body only converts beta-carotene to the active form of vitamin A if it NEEDS it.

Coming from someone who supplements cod liver oil (that contains high amounts of retinol - the active form of vit A) without having vitamin A toxicity symptoms, I think you are more than safe eating 2 yams a day. The worst thing that could happen is that you turn orange, just like magic school bus! http://en.wikipedia.org/wiki/Carotenosis

But like Psyence said above me, anything in excess can cause problems. Make sure you keep an eye on how you feel while eating that many yams. Personally I can only eat like 1/4 yam at one time, I do like my carrots though.

F823371a5c530abf36eab29b7ce3ee2a

(50)

on August 16, 2013
at 05:19 PM

Thanks a lot, I do notice some itching when I eat too many, or any other starch, usually combined with lack of sleep. Would love to cut down but I just drop too much weight without carbs. I am already thin and have tried adding more fat too boost cals but doesn't seem to work.

1
6629b9ed6548231f4774d39a0641a573

on August 16, 2013
at 03:31 PM

There was another question on PH concerning this, but the study was based on beta-carotene supplementation, not those from whole foods.

This is how the study you posted was carried out:

"Curley manufactured a series of beta-carotene-derived molecules in the lab that match those that exist in nature. The researchers then exposed these molecules to conditions mimicking their metabolism and action in the body."

What you're eating are whole foods, not "isolated beta-carotene-derived molecules." Not to mention traditional cultures ate diets high in beta carotene from sweet potato (eg. the Okinawans).

Anything in excess can cause problems. 2 sweet potatoes plus carrots every day sounds like a lot, but if you're active and see no problems, you're probably fine. It would be wise to vary your vegetables though. As long as you are not purposely eating sweet potatoes and carrots FOR vitamin A, there should be no risk of beta-carotene inhibiting vitamin A activity. Most bioavailable vitamin A comes from animal products anyway.

F823371a5c530abf36eab29b7ce3ee2a

(50)

on August 16, 2013
at 05:17 PM

Thanks that's a great answer. I think I just solved the problem. I am gonna switch to white sweet potatoes that have far less beta-carotene.Then I can also add in some liver, etc.

0
Medium avatar

on August 16, 2013
at 03:28 PM

I wouldn't worry about it too much humans can't convert all of the beta carotene they absorb into vitamin A. I believe that less than 10 percent is converted correct me if I am wrong.

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