Quote:
Originally Posted by halo104
The thing to remember is that glucose is the only fuel that your brain can metabolize, so if you start to severely limit your carbs, your brain function gets all wacky. Carbs are EXTREMELY important to a normal body, even during weight loss. It's so important to not limit them any more than 50 grams because a person can start to see ill side effects.
I'm huge for carb reduction, but it's important to look at the bigger picture too 
ETA:
Glucose is not the only fuel- certain parts of your brain can ONLY burn glucose, but it can also run on ketones. However, research does suggest that the brain runs better on carbs, so just be careful and watch your body! Only you know what is truly good for you!
The body can make glucose from proteins and fat (in the liver). The traditional Inuit diet during much of the year is virtually all fat and protein, and they do quite well on it, if they avoid nontraditional foods. They do eat a variety of low-carb and high phytonutrient plant foods such as blueberries and wild plants, but the calorie and carb content is considered negligible.
The research on very low carb diets, seem to support the conclusion that carb intake isn't all that important so long as diet and/or fat stores are sufficient to make the glucose required.
If you're very active fat stores and diet may not be able to make glucose fast enough individually (thus for some people, caloric intake AND a certain amount of fat stores must BOTH be available to make enough glucose to support body and brain). This is why very low calorie diets (regardless of carb intake) often advise against exercise - because the body may burn through glucose faster than it can be manufactured).
There are very good reasons to avoid a zero-carb diet, but very few low-carb, even VERY LOW, advocate eliminating all carbs. If you're eating a wide variety of low and lowish carb fruits and vegetables (or even just vegetables) you should be able to produce enough glucose for your brain and body unless you're also taking in far too few calories or are burning calories too quickly to keep up with your body's glucose building. This is a very recognizeable event. You'll feel sick and lightheaded and a small amount of carbohydrate will almost instantly make you feel better.
A longer term solution, if you feel lousy or sluggish mentally or physically on low-carb, is to increase your veggie, protein, and fat intake, which will work just as well as eating more carbs (at least if your goal is weight loss).
If your goal is weight gain, or if you have no body fat to spare, it would make more sense to add carbs. The body is more efficient at getting glucose from carbs than making it from protein and fat, but for weight loss, efficiency isn't so great. You want to make your body to use more energy, not less. Providing large amounts of carbs, just provides the body with a "short cut." Great if you want to maintain or gain, not so great when you want to lose.
It's easier for the body to make glucose from carbs than from proteins and fats, but when you want to lose weight, in most cases easier is not better. The more energy (calories) you can make your body use, the better, and it takes less energy to burn carbs for fuel than it does to burn proteins and fats.
This is why many people (including me - when I follow it) find that they consistently (not just in the early water loss/ gain phase) lose better on low-carb than on high-carb when calories remain the same.
For me, it's amounts to a 300 calorie difference. I lose about the same on 1800 calories of low-carb or 1500 calories of high carb. Since the more carbs I eat, the hungrier I get, it would seem a no-brainer, my biggest problem is convince myself that eliminating all grains is the way to go, so I end up eating more carbs than I could and should be eating.
If I could convince myself of what I logically know: that is that eliminating ALL grains, potatoes and high-sugar fruit is safe and reasonable, I'd be where JerseyGyrl is now, rather than having 175 lbs to lose and 30 lbs to re-lose.