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I know there's nothing wrong with moderating your carb intake. That's why I love the caloric based diets more because it's all about moderation.
As we all know carbohydrates or 'sugars' are big sources of energy for the body (especially the brain). One can survive on a low carb-high fat diet but one's body has to work overtime to process the proteins into carbs through gluconeogenesis. (Especially one's kidneys that work to get rid of the other by products when protein breaks down to create such sugars.)
Gluconeogenesis happens both during intense exercise and when the body is starved of energy.
I'm sure 'gluconeogenesis' hasn't escaped top dieticians. It's how the process of gluconeogenesis comes about that can be unhealthy and that's why low carb diets are frowned upon by many dieticians.
Also, it is extremely unhealthy to be on a low carb diet if one has a kidney disease such as Hypoglycemia (someone with low blood sugar) because the kidneys have to work even more to provide energy for the body. I have a friend who has it and she has to eat a lot of cookies and juice everyday just so she doesn't pass out. I know that I get dehydrated easily. A low carb diet in which the body needs to make up for lost glucose through the process of gluconeogenesis puts a lot of strain on the body's kidneys. Therefore, elimination happens much more often because your kidneys have to get rid of the other by products of the protein. An effect of this can be dehydration if you're not careful.
I'm not saying you can't live low carb, I'm just not recommending it. If you have been doing it for a long time the body will adjust to having low carbs and you'll feel more energy than you would if you were just starting low carb. It's not something you can jump into. When doing intense exercise while being on a low carb diet, the body needs to work double overtime to get the energy needed to fuel your brain when starved of sugars and to fuel your body while exercising. Although they are different forms of gluconeogenesis, it still puts a lot of strain on you if both exercising and low carb dieting at the same time.

~that was lengthy, and my brain is now tired...I'ma go eat a cookie to refuel..j/k j/k 4laugh

Complete, total, and utter bull.

If you have hypoglycemia, low-carbing is the best thing you can do for yourself. You see, if you keep trying to stock on on cookies and crap for energy, you're setting yourself up to develop diabetes - eventually, those hyperactive pancreas will burn out. So what's to do?

-Moderate sugar intake so it can NEVER produce an "insulin spike" resulting in a crash.
-Provide the body with enough fat and protein for energy that it doesn't need to rely on so many carbohydrates for energy.

Furthermore, your friend should not be eating juice and cookies. What she should be doing is cutting out any and all processed carbohydrates from her diet and limiting her carbohydrate intake to mostly vegetables, certain fruits, and SOME whole grain products.

(Apples, bananas, and grapes should be avoided - these are insanely sugary fruits. More on our genetically engineered mutant sugar bombs here.)

As it is, I have hypoglycemia. There is no way I'd change the way I eat for the horrible feeling of low bloodsugar again. I'm an annoying personality enough as it is; I'd rather be moderately bearable between mealtimes.

That whole "OMG bad for your kidneys!!!" junk is... junk. It was a myth that started because people with kidney problems are often recommended a low-protein diet. So, it was assumed that protein has something to do with causing kidney problems in the first place.

Also, most people don't eat a carbohydrate level so low that they're in gluceoneogenesis. I brought it up because I am sick and tired of the "OMG low-carb = death sentence!!!" people.

And contrary to popular belief and mass media hype, low-carb is NOT no-carb.

People on low-carbohydrate diets, if they are following them correctly, are eating carbohydrates in the form of vegetables, low-sugar and low-glycemic fruits, and whole grains. People who have gone on Atkins often report that they now eat more vegetables than ever. (And here we were told it was all about steak and butter!)

There's a lot more I could go into, but instead I'll just post some links.
Low Carb Myths
The Cure For Diabetes
Dietary carbohydrate restriction in type 2 diabetes mellitus and metabolic syndrome: time for a critical appraisal

And more links, if you want to dig deeper...
Weston A. Price Foundation
Second Opinions

Fitness:

I agree with everyone else...walk! Then build up to jogging. My husband was a smoker and when he quit and tried running, he did so bad that he could barely do 2 miles and coughed a lot. Now a couple years later he ran his first marathon, 5 miles, and did his personal best.

I'm trying to run as well, I hate it but you can feel that it's good for you. We also got Nike+, which tracks your running and such, and that's kind of fun and motivational. If you have a Nano, you can hook up the Nike+ and it actually talks to you as you run.

Keep doing WiiFIt too! It's a good work out and good for toning your body when you start loosing that weight. I'm some what fit, yet there's things on there that kick my butt....like the push ups gonk I love the hula hooping, even though it hurt so bad! hee hee

Diet:

Moderation! A little bit of everything is good! Eat smaller portions, you're body will actually get used to eating less. And treat yourself! Have those bad yummy foods sometimes!

I read in a mag last year that it take 3500 calories to loose a pound. Cut out calories and exercise and you'll loose in no time.

And the more you have to lose, believe or not...the easier is it to lose weight. When I started to lose weight (i lost about 80lbs) those first like 50 went away quickly. The last 10ish pounds, a pain! heh