Is it possible to consume too much vitamin A?
459444
If we are refering to natural sources, no.\nCarrots, for example, contain the precursor of vitamin A (beta-carotene)and this is safe to consume.\nBeta-carotene is stored in the liver and converted in vit.A,as needed.So, you don't have the risk of an excessive amount of vitamin A in your body.\nFor more information, check out this link\nhttp://en.wikipedia.org/wiki/Beta_carotene#Carotenemia\n\nKaterina
911359
The term vitamin comes from vital amine, which means that yor body needs them . If youare getting a varied diet, you probably do not need to take vitamin pills. Vitamins A,D,E, and K are fat soluble. You can get an overdose with too many vitamin pills. The others are water soluble and you can not overdose. What is important is to get the right number of servings of fruits and vegetables, milk products and meat or meat substitutes to be sure you have the needed vitamins. % servings a day for tose fruits and vegetables. 4 servings of grains, 2 meat and 4 milk.
911666
interesting question, carotenes are precursors of vitamin A, this article explains, good luck
713717
Too much is 1000 micrograms a day (which is one miligram).\n\nThe reason ther is an upper limit set by the government is because it can mask a vitamin B12 deficiency.\n\nIf you take around 15mg a day (which is A LOT), you may have insomnia, malaise, irritability and GI distress.\n\nRegards,\nRyan
81094
Vitamin E is safe and necessary.  There are three specific situations when a vitamin E deficiency is likely to occur. It is seen in persons who cannot absorb dietary fat, has been found in premature, very low birth weight infants (birth weights less than 1500 grams, or 3 1/2 pounds), and is seen in individuals with rare disorders of fat metabolism. A vitamin E deficiency is usually characterized by neurological problems due to poor(bad) nerve conduction.\n\nThe health risk of too much vitamin E is disputed. A recent review of the safety of vitamin E in the elderly indicated that taking vitamin E supplements for up to four months at doses of 530 mg or 800 IU (35 times the current RDA) had no significant adverse effect on general health, body weight, levels of body proteins, lipid levels, liver or kidney function, thyroid hormones, amount or kinds of blood cells, and bleeding time. Even though this study provides evidence that taking a vitamin E supplement containing 530 mg or 800 IU for four months is safe, the long term safety of vitamin E supplementation has not been authoritatively tested. However, "toxicity symptoms have not been reported even at intakes of 800 IU per kilogram of body weight daily for 5 months" according to the Food and Nutrition Board (Rosenberg, et al), an amount that corresponds to 60,000 IU per day for a 75 kg adult.
454133
Good question. Well your liver and kidneys can put up with a lot, but some things they just cant process. Like for instance too much carrots can turn you yellow, and thiamine acid can turn you reddish, but it would take a lot to do so. Also each person is different so consult your doctor. Bit from my point of view eating healthy is OK, just REALLY mo niter those supplements because accidents happen, and it could really hurt you. Your best bet is just to go talk to a doctor or nutritionist
1001056
Yes, talk to your doctor.  Perhaps it is connected to your medication, and only your doctor can advise you there.\n\nThe only time I suffered with headaches was when I took vitamin A or E tablets daily (separately).  It felt like I had overloaded the back of my head.  So now I don't take vitamin tablets and just make sure to treat myself to a balanced diet.  Although I know that there are some ailments that are treated with vitamins.  \n\nI think that the sooner you speak to your doctor the better
877683
Well, Vitamin K is the big one....but you can eat as much of it as you want as long as you are CONSISTENT with it.  I am on both Coumadin and aspirin and eat a diet high in Vitamin K.\n\nVitamin K and warfarin can be thought of a sitting on opposite sides of a teeter totter.  What you do to one side will affect the other side.  However, this does not mean that you cannot bring things back into balance.\n\nFoods that are high in Vitamin K include asparagus, leaf lettuce, broccoli, cabbage and others.  What a person taking warfarin needs to do is avoid making large changes in the consumption of these foods.  If you routinely eat large amounts of these and start taking warfarin, you will need a higher dose of warfarin than if you did not eat as much of the high vitamin K foods.  Remember, it is not the dose of warfarin that you take that is important, it is your INR.  \n\nAlmost everyone will go out to a dinner and occasionally eat much more vegetables that they normally consume.  This will cause the INR to decrease (increase your risk of getting a blood clot) in about 36 to 72 hours.  Is this important?  It could be, but in most cases, you will, "get away with it".  This is because you will return to your normal amount of vegetable consumption after this one meal and your INR will not be down for very long.\n\nWhere the major risk occurs is when a person taking warfarin decides to go on a diet and increase their eating of salads.  This tends to decrease the INR for longer periods of time and puts them at significant risk of developing a blood clot.  If you are going to switch to this type of diet, discuss it with the person monitoring your warfarin. so that your INR can be checked and the warfarin dose adjusted accordingly.\n\nAnother source of vitamin K which is frequently overlooked are the supplements such as Carnation Instant Breakfast, Ensure and Boost.  These contain significant amounts of vitamin K.  The TV advertising does not adequately warn the consumer of this.  Physicians often overlook this also.  When I see a thin, elderly lady whose INR is suddenly low, the reason she often gives is that her doctor told her to start taking one of these supplements.  It is usually necessary to increase the warfarin dose after these products are started.\n\nMany people do not consider taking vitamins as taking "drugs".  They start and stop without much thought.  If they lack energy, they start vitamins.  If they lack money, they stop vitamins.  This probably the single largest reason why people cannot get their warfarin dose regulated.  They do not consider these items to be important.  However, they are very important.  Taking vitamins on an occasional basis will cause the INR to fluctuate so that the warfarin dose cannot be regulated.\n\nWhat about the opposite, decreasing your intake of vitamin K.  This usually happens when someone becomes ill and cannot eat.  If you are unable to eat your normal amount of vegetables for two or three days, your INR will begin to increase (increase your risk of bleeding).  It is important that you have your INR checked and your warfarin dose adjusted if this happens.  This is hard to do because you are feeling so bad that you do not want to go out of the house, but it can be important.  Stomach flu and cancer chemotherapy are two of the reasons that this happens.\n\nPeople also use "fruitsandvegetables" as if they were one and the same.  You will notice that when I listed foods that were high in vitamin K, there were no fruits listed.  Whenever, I asking someone about changes in their eating patterns and they say, " I haven't been eating many  vegetables, BUT, I have been eating a lot of fruit," I know that their INR is most likely high.  You need to consider fruits and vegetables as two separate things as far as warfarin is concerned.\n\nThe dried leaves of green tea contain a large amount of vitamin K.  Unless you eat the leaves, as they do in some cul
935319
You have decided to become a Mom!  Congratulations!!  I appreciate your eagerness to fortify yourself before becoming pregnant with a child.\n\nAre you so anaemic that you have to take all these vitamins/folic acids?  Excessive intake of vitamins/folic acids is harmful.  \nThe right way to do it to consult your gynaecologist.  She/he will check you up and prescribe, if necessary, the requisite vitamins/folic acids.\n\nFor the time being please maintain proper diet regimen.
179679
I think olive oil has a lot of vitamin E in it, so that might have something to do with it.
1107135
Interestingly enough...to add to ur findings...I have been told by my family doctor that most people do not need a vitamin if they are healthy adults who eat right.  And I have personally never been able to take centrum because it would always make my stomach sick.  I'm checking out that site now.
327870
Don't self prescribe vitamin A, you could seriously damage your body or kill yourself.  Acutane is your best choice and is well controled by doctors (I used it and loved it).  PS.  Explores in the artic died after eating polar bear liver because it was so high in vitamin A, so don't be stupid and do it on your own.
8529
Maybe you're not getting enough of a particular vitamin. Have you changed your food habits recently? I can't think of any other reason...
415859
It is certainly possible to have too much protein at one time. Some effects of excess protein include\n\n# Overreaction within the immune system\n\n# Liver dysfunction due to increased toxic residues\n\n# Loss of bone density, frailty of bones is due to calcium and glutamine being leached from bone and muscle tissue to balance increased acid intake from diet (blood pH is maintained at around 7.4). This effect is not present if intake of alkaline minerals (from fruits and vegetables, cereals are acidic as are proteins, fats are neutral) is high. In such cases, protein intake is anabolic to bone.
655873
Too much can obstuct a persons intestines. Paper is not meant to be eaten. Eating non food items can sometimes be a symptom of a vitamin/mineral deficiancy. She needs to go to the doc.
536805
Hmm you could start by looking to see if there is a relationship between vitamin use and cancer. Or even the tried and true cancer and smoking. IT really depends on what kind of data you have access to or if you are going to collect your own.
146033
Try This:\nhttp://www.wrongdiagnosis.com/v/vitamin_a_deficiency/causes.htm