Why can't your body make vitamins?
This is an excellent question whose answer is easy to obtain. Since we cannot synthesise vitamins or can only do so in amounts insufficient to meet our needs, they must be obtained from the diet or from some artificial source, hence vitamins are termed essential nutrients. Since the body very simply cannot create many of the vitamins it needs, a good multivitamin is important. If a vitamin is absent from the diet or is not properly absorbed by an organism, a deficiency disease may develop or the individual may feel lethargic, irritable and not be as mentally alert.
To use a car analogy as an example, bear in mind that you only get one body, but you can always seek out a new car. Think of your body as a well constructed machine, with trillions of interlocking parts, bolts and nuts if you will, that all help each other and work together to tirelessly sustain life on a daily basis. This, at least in a simplified way, is how your body works, but we all know the kinds of painful effects that malnutrition, disease and injury can have on a person.
When your body lacks the important raw ingredients it needs to run properly, a cascading effect occurs that affects every one of your body's systems and causes them to function poorly or even cease functioning altogether. Taking supplemental vitamins is akin to using high octane fuel for your car, only many times better and far less expensive. Your body runs more steadily and is able to better resist breaking down and disease. Your immune system functions better, your thinking clears and your body operates better when it has the vital nutrients it needs. Unfortunately a side effect of our diet means that a vast majority of people every day are lacking the most basic nutrition warranted, let alone obtaining optimum nutrition levels.
There are two groups of essential vitamins, each classified according to the materials in which they dissolve.
Water-soluble vitamins dissolve in water, are not held onto and are removed regularly in urine. We need a continuous supply of these vitamins. The water-soluble vitamins are Vitamin C and the B-complex group. Water-soluble vitamins are often destroyed or removed during food storage or cooking. To reduce vitamin loss, refrigerate fresh fruit, and store grains away from sun light.
A, D, E and K, dissolve in fat before they are absorbed in the blood and are held onto in the liver.
An effective point to note is that we definitely need vitamins, to function effectively and be well. Our bodies cannot produce many of the vitamins that we need on a daily basis. We must source them in our food, and by eating a multivitamin supplement.