The Good, The Bad and The...Carbs!

Carbohydrates!  Did you flinch?  Hide?  It seems these days that little word (okay, it's a pretty long word) sends fear into so many people and has prompted so many arguments within and without the medical community.  You have fitness gurus, nutrition store workers, chiropractors, medical doctors, and all kinds of people making claims to "stay away" from those bad, awful, belly-bulging carbs, right?  Are they right or just inappropriately generalizing?  I think those people are taking the good of carbohydrates, ignoring them, and lumping them in with the bad.

Carbohydrates are NEEDED by our bodies.  Here's an idea - ask a dietitian or nutritionist (or anyone that spent longer than one semester learning about nutrition - not counting online researching).  Everything in excess becomes a toxin or a bad thing for us.  Too much protein can cause havoc in your stomach, your liver, etc. and lead to so many other issues.   The fact is that most people don't reach for the legumes when they're told to increase their protein and limit their carbs.  Nope, they go straight to the fatty animal proteins, with their cholesterol and saturated fats. Yep, that's so healthier, right?  Forget that bologna if you're trying to lose weight (no, really, bologna is mega bad for you on so many levels)...it's a basic equation to lose weight: More calories out than calories in. PERIOD.

As for thy mortal enemy "The Carbs", the ones we really need to stay away from as much as possible are the overly-processed sorts:  white sugars, white breads, white rice, etc.  (notice a "white" theme here?)  What those folks don't mention is that lettuce is a carb but have you ever seen an obese wild rabbit?? Ya, I didn't think so.  I don't think that even most people know exactly what a carbohydrate is...do you?

First of all, carbohydrates (carbo=carbon, hydrate=with water) are compounds composed of carbon, oxygen, and hydrogen arranged as monosaccharides or multiples of monosaccharides (mono=one saccharide=sugar; they follow a general formula of C6H12O6 & form a single ring).  Did I lose you? Basically, a monosaccharide is the smallest form of sugar.  Now, there are two categories of carbohydrates: simple and complex.  You've probably heard people talk about "simple sugars" or "complex carbohydrates" but, really, what's the difference?  They are either simple or complex :-D  Okay, simple carbs are either monosaccharides or disaccharides and are easy for the body to access or store for immediate energy.

The most important of the simple carbohydrates are:
     -Monosaccharides
        1) Glucose
        2) Fructose
        3) Galactose

     -Disaccharides (pairs of monosaccharides)
        1) Maltose (glucose + glucose)
        2) Sucrose (glucose + fructose)
        3) Lactose (glucose + galactose)

The complex carbohydrates contain many glucose units, including sometimes other monosaccharides.  These are all strung together to form polysaccharides (poly=many).  There's another word in this category - oligosaccharide (oligo=few), which has less units than polysaccharides but more than the simple carbohydrates.

So, why are carbohydrates so darn important?  They're important because, eventually, all these carbohydrates, simple or complex, get turned into their basic forms - glucose or glycogen.  (Glycogen is what our bodies store extra glucose into that isn't immediately needed/used.)  These two basic carbohydrates provide about half of all the energy that our muscles (and other body tissues) use to function.  The other half is provided mostly by stored fat.  Glucose is the "food" preferred by our brain cells and nerve cells to function efficiently.  Also, it's super important for muscle function (which helps when we exercise).

But there are carbohydrates we should try to avoid most of the time and ones we shouldn't, especially if you're looking to lose weight.  It's a matter of making the right choices most of the time.  Sometimes it's difficult to choose between a slice of chocolate fudge cake and a bowl of fresh fruit for dessert...it's difficult to choose carrots over pretzels...trust me, I know!  And, sometimes, you just have to go for that piece of cake and that's okay too but remember that those are "empty" calories (foods that deliver energy but little or no protein, vitamins or minerals) and that there are healthier, more nutrient rich carbohydrates out there.  It's all back to choosing one's calories wisely and trying to go more toward nutrient-dense foods (e.g. a candy bar at 92 calories versus a bowl of soup at 90 calories).

Let's stop with giving carbohydrates such a bad reputation!  They are our fuel and some of them pack a mighty nutrient punch too!  Embrace the carbs!

Oh and this topic isn't over yet...look for my next entry about what happens to your body on a low dietary carb diet!

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Nutrients

You've heard the word or at least seen it - nutrient.  What is it exactly?  Obviously, it has something to do with nutrition - right.  Nutrients are, basically, chemicals derived from food that our bodies use for energy, structural materials (bone, etc.), and regulating agents for growth, maintenance, and tissue repair.  Hmm, pretty important stuff those darn nutrients.  Nutrients are broken down into various categories, depending on what is being discussed:

• Macronutrients are those nutrients that our bodies need in large amounts such as carbohydrates, fats, and proteins (macro=large);
• Micronutrients are the nutrients that our bodies need in smaller portions such as vitamins and minerals (micro=small);
• Essential nutrients are nutrients (chemicals) that we require from outside our bodies.  In other words, our bodies can't produce them or we produce them in too small quantities to meet physiological needs -- there are approximately 40 essential nutrients, by-the-way;
• Organic nutrients - no, not like organic produce but it relates to the nutrients that contain at least 1 carbon molecule.  These are the vitamins of which there are 13.
• Inorganic nutrients are nutrients that do not contain any carbon molecule.  These are the minerals and there are only 16 of them that are known to be essential in human nutrition.

Now that we have all of that cleared up, I'd like to discuss these nutrients :D  You knew that was coming, right?  Right.

There are six classes of nutrients required by our bodies.  They are:

1. Carbohydrates - macronutrient; provides energy; organic
2. Lipids (aka fats) - macronutrient; provides energy; organic
3. Proteins - macronutrient; provides energy; organic
4. Vitamins - micronutrient; organic
5. Minerals - micronutrient; inorganic
6. Water - inorganic

 NOTE: There are other compounds in foods that our bodies utilize (fibers, phytochemicals, etc.) but these are not considered nutrients...just wanted to clarify that.


Macronutrients. When the body uses carbohydrates, fats, and proteins for energy or fuel, the bonds between the nutrient's atoms break and releases the energy into our bodies.  Some of the energy is released as either heat or it's used to send electrical impulses (messages), to synthesize body compounds, and to move muscles.  If either of these macronutrients is not used up in the body, what do you think happens?  Yep, it gets stored in the body for some day in the future when the intake is inadequate or during the night while you sleep or even for in-between meals.  Speaking of which, your body continues to use energy (your brain especially) while you sleep therefore depleting stored reserves and helping you to lose weight - that's why it's so important to get enough hours of sleep if you're trying to lose weight!  And, did you know that our brains (since we've sidetracked a bit about that fine organ) use glucose for fuel and that our bodies produce that from the carbohydrates we eat?  The only animal product that has enough carbohydrates for this are dairy products...take that, Atkins dieters. Click here to learn more.  These same macronutrients (carbs, protein, & fats), also provide the foundational materials to build tissues and regulate many of the body's activities/functions. (FYI - Protein is NOT a major energy provider but is more of a structural building block. It also helps to regulate digestion and metabolize energy.)
 
Vitamins. Obviously, vitamins don't directly provide energy to the body but they do play their part. These little (micronutrients) powerhouses help the macronutrients release their energy and they do a bunch of other things throughout the body too.  Each of the 13 vitamins has a starring role in the body because almost every action in the body requires the help of vitamins.  Also good to know - vitamins can only function properly if they are intact.  Their molecular organic complexity makes them vulnerable to being destroyed by heat, light, and chemical agents!  This is why steaming veggies for a very short time (or eating them raw) is a preferred and healthier method of preparation.  Just for fun, here are the 13 vitamins: 

1. Vitamin C (water soluble);
2. Eight (8) B vitamins (water soluble) - thiamin, riboflavin, niacin, B6, B12, folate, biotin, and pantothenic acid;
3. Vitamin A, D, E, & K (fat soluble).

 Minerals. These also don't fuel the body's energy needs but they are important to the body's structures.  There are only 16 known essential minerals in human nutrition, even though they are studying others to figure out if they have a significant function.  Being inorganic, minerals are pretty much indestructible but they can bind to other substances that might get in the way of the body being able to absorb them.  They can also be lost during food-refining processes or when cooking because they seep into the preparation water that is thrown out. Major minerals are equivalent to macronutrients in that they are needed in large amounts and trace minerals are needed in smaller amounts.

1. The major minerals are: calcium, phosphorus, potassium, sodium, chloride, magnesium, & sulfate.  For more information on the major minerals, go here.
2. The trace minerals are: iron, iodine, zinc, chromium, selenium, fluoride, molybdenum, copper, & manganese.  To learn more about trace minerals, go here.

 Water.  Everyone has heard of how important water is to the proper function of our bodies, right?  It must be really important if a 150lb body contains about 90lbs of water! It's used in metabolic reactions, helps transport vital materials to cells, helps carry away cell waste products...it's really important.  We can go (on average if we're healthy) about 8 weeks without food but we can die in a matter of hours without water.  

So, drink your water and make sure you're getting all of your nutrients!

All information on this blog is my own pursuit of information on the road to getting my BS in Nutrition Science and as a mode of studying. Most information and data was taken from my textbook "Understanding Normal and Clinical Nutrition" by Rolfes, Pinna, & Whitney, ISBN-13: 978-0-495-55646-6

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