Only synthetic vitamins can be harmful if taken in excess. Natural (food-based) vitamins will be flushed out easily by the body if not needed. They are much more easily absorbed, and you are thus more likely to experience health improvements with natural vitamins.
It depends on the vitamin. If the vitamin is a water-soluble vitamin like vitamin C, your body will use what it needs and pass the rest (normally through urine.)
If it's a fat soluble vitamin like potassium, it can build up in your system and cause illness and potentially death.
As always, there is always a danger of having too much or many. Usually, excess water-soluble vitamins exit your body via your urine but a study in August 2010 revealed that this is reduced when you fasted, leaving the excess vitamins in your body causing all sorts of damage.
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Yes excessive cooking does destroy the vitamins.
Yes you can. It depends on what type of vitamins. Excessive amounts of some vitamins can be dangerous. Yes, you can overdose on vitamins. Vitamin A overdose can harm bones and infants. Such symptoms as nausea, vomiting, diarrhea, and rash can be found in those with overdoses of vitamins. You really should consult your physician.
It is best to obtain vitamins and minerals through food sources. Excessive intake of vitamins and mineral supplements can cause serious physiological problems.
calories majority of calories from fat excessive sodium excessive saturated fats in some cases, trans fats (which are very harmful) low nutrition density relatively few vitamins and minerals excessive sugar or corn syrup highly processed ingredients low fiber
Minerals will help you stay healthy, and in "performance" shape
Excessive intake of spinach may lead to Poor Mineral Absorption, Diarrhea
While vitamins are essential for health, excessive intake of certain vitamins can lead to toxicity and adverse health effects. It is important to follow recommended daily allowances and consult with a healthcare provider before taking high doses of vitamins, especially in supplement form. A balanced diet rich in fruits, vegetables, and whole grains is typically the best way to obtain necessary vitamins and minerals.
Excessive dosages of any substance is not advisable. They work better at their indicated dosages. Some vitamins may be taken on a higher dosage than the RDI, but only under medical prescription. A graduate pharmacist is able to guide you on vitamins, as well.
Vitamins that are oil (fat) soluable, such as vitamin E, A & D are retained/stored in body tissue and are the type of vitamin that you have to be careful of. Vitamin A is especially toxic, and it doesn't take much effort these days to get too much of it, with it now being added to so many processed foods that are sold under the banner of "fortified with vitamins and minerals". The oil/fat soluable vitamins aren't the only thing that you need to watch out for, too large of a dose of minerals, such as copper are bad as well. Water soluable vitamins, such as B & C are expelled in your urine, that's why urine becomes more yellow in color after you take one of the "mega dose" multi- vitamins. The excess that your body can't use goes down the drain in your urine, along with the money you spent on the excessive and unecessary dose. The practice of fortifying food with vitamins and minerals simply as a marketing ploy to get you to choose one product over another has gotten completely out of hand.
vitamins
Fatigue,excessive speed and distracrion
Hypertrophy means excessive development or excessive formation.