Several forms ( vitamers ) of vitamin D exist. The two major forms are vitamin D 2 or ergocalciferol, and vitamin D 3 or cholecalciferol; vitamin D without a subscript refers to either D 2 or D 3 or both. These are known collectively as calciferol.  Vitamin D 2 was chemically characterized in 1931. In 1935, the chemical structure of vitamin D 3 was established and proven to result from the ultraviolet irradiation of 7-dehydrocholesterol. 
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How Can Understanding Your Metabolism Help You Lose Weight?
Many Western countries are noticing that more and more of their citizens are becoming obese. The United States is especially aware of the growing problems with obesity in today's society and trying to figure out how to solve this problem.
There is a lot that obese people can do on their own to eat better and control their weight if they are willing to do some research. It is odd that with the many people who seek higher education in the United States as compared to other countries, there are so many people who do not understand their metabolism.
When people know how their metabolism works, they will have a better understanding of the steps they need to take to begin losing weight. They will know about the science of weight loss, which is very helpful when choosing weight loss products and programs. People have to be willing to work on improving their metabolism if they want to burn more calories and lose weight.
A lot of people buy pills and other products that claim to improve their metabolism without understanding how metabolism even works. People need to know about their metabolism and how it affects their weight so they can make good choices when it comes to weight loss programs and products. They can avoid those that will not work for them and those that are just scams.
Your metabolism is a necessary body process for your survival and provides power for your body. Your metabolism is a chemical process that involves burning the energy and fat your body has stored to provide fuel for the body. The many different involuntary processes that occur in your body are almost all controlled by your metabolism, including cell respiration and growth, digestion and more.
Your basal metabolic rate (BRM) refers to your metabolism. Basal means the lowest or base metabolic rate and the term refers to the amount of energy your body can burn while resting. A body that is working well is going to need more energy and that means it will burn more calories and fat. Your BRM measures the number of calories you have to consume each day for your body to function and for you to live as long as you are not exerting yourself in any way. If you wish to speed up your metabolism you need to first increase your BRM.
You can get a higher BRM by doing a few different things. One way is to begin exercising regularly because this makes your body ready to work harder all day long. A lot of people try to figure out what their BRM is but if you want an accurate reading, you need to talk to your doctor. He can tell you what your BRM is and how you can increase it so you can lose weight. Some of the pills that claim to increase your metabolism will make you feel like you have more energy but no one in the medical community believes they increase your BRM.