do you know what is the Nutrition ?
7:59 AM
Egyptian Engineer
, Posted in
To
use food wisely, you need a firm grasp of the basics. In this part, I
define nutrition and give you a detailed explanation of digestion (how
your body turns food into nutrients). I
also explain why calories are useful and set forth a no-nonsense starter
guide to your daily requirements of vitamins, minerals, and other good
stuff.
What’s Nutrition?
Energy is the ability to do work. Virtually every bite of food gives you energy, even when it doesn’t give you nutrients. The amount of energy in food is measured in calories, the amount of heat produced when food is burned (metabolized) in your body cells.But right now, all you need to know is that food is the fuel on which your body runs. Without enough food, you don’t have enough energy.
Nutrients in food
Nutrients are chemical substances your body uses to build, maintain, and repair tissues. They also empower cells to send messages back and forth to conduct essential chemical reactions, like the ones that make it possible for you to
do everything else natural to a living body.
Food provides two distinct groups of nutrients:
[1] Macro nutrients (macro equal to big): Protein, fat, carbohydrates, and water .
[2] Micro nutrients (micro equal to small): Vitamins and minerals .
What’s the difference between these two groups? The amount you need each day. Your daily requirements for macro nutrients generally exceed 1 gram. (For comparison’s sake, 28 grams are in an ounce.) Let's explain, human man needs about sixty three grams of protein a day (slightly more than two ounces), and human woman needs fifty grams (slightly less than two ounces).
Your daily requirements for micro nutrients are much smaller. For example,
the Recommended Dietary Allowance (RDA) for vitamin C is measured in milligrams (1.1,000 of a gram), while the RDAs for vitamin D, vitamin B12, and foliate are even smaller and are measured in micrograms (1.1,000,000 of a gram). You can find out much more about the RDAs, including how they vary for people of different ages.
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