If you’re a frequent visitor to this website, or listener to the, you’ve probably gotten the idea that I’m a pretty big fan of limiting your carbohydrate intake.
And you’d be right.
To understand why low carbohydrate eating can bestow some significant health and performance advantages, check out my or listen to the perils of constantly elevated blood sugar levels in this episode with Nancy Appleton:
Or go read about how physically active individuals may be able to actually benefit from strategic low carbohydrate intake in my article or (if you’re a Rock Star Triathlete Academy member) you can read
In a nutshell, pun intended, as you begin to increase carbohydrate consumption above the levels that you need for survival or periods of intense physical activity, you lose your ability to rely on fat burning mechanisms, and you experience the damaging effects of chronically elevated blood sugars, including neuropathy (nerve damage), nephropathy (kidney damage), retinnopathy (eye damage), increased cardiovascular disease risk, potential for cancer progression (tumor cells feed on sugar) and bacterial or fungal infection.
Unfortunately, whether due to a misinterpretation of what low carbohydrate dieting actually is or an “all-or-nothing” approach to restricting carbohydrates or perhaps the influence of low-carbohydrate-done-wrong diets like Atkins, many people (and especially athletes) try or attempt to try a low carbohydrate diet and end up messing the whole thing up, experiencing the hidden dangers of a low carbohydrate diet and hurting their bodies.
So what are the hidden dangers of a low carbohydrate (AKA “ketogenic”) diet?
Here are the low carbohydrate risks, in ten steps:
1. Your body stores carbohydrate, mostly in your liver and muscles, in the form of glycogen. Depending on your size, you can store roughly in the range of 1500-2000 calories of storage carbohydrate (although that number is fairly variable based on your fitness and size).
2. If you’re sedentary and don’t really exercise much (which I don’t encourage), this amount of storage carbohydrate is more than sufficient to get you through a typical day. Really, your body only needs a maximum of 600 calories of carbohydrate to survive each day – and that carbohydrate can be derived from diet, or from you own storage glycogen.
3. But if you’re active and at the same time consuming a low carbohydrate diet, you can easily burn through your liver and muscle glycogen stores in anywhere from 2 days to a couple weeks. The nice part about this, if you’re trying to lose weight, is that since glycogen carries up to four times it’s weight in water, a low carbohydrate diet can quickly shed 5-10 pounds (or more), which seems quite satisfactory. But the problem is, most of what you’ve lost is A) energy to sustain intense physical activity and B) water.
4. So now you have very little storage carbohydrate and are potentially dehydrated. If you’re an athlete or a physically active individual, this means that you’re limited to utilizing fat as a fuel for energy. Fat, through a process called “beta-oxidation”, can provide tens of thousands of calories of readily utilizable fuel, but the problem is that it burns far more slowly than carbohydrate.
5. This means that if you’re on a strict low carbohydrate diet, you can say goodbye to intense weight training, track intervals, or just about any activity that would be consider “tempo”, “threshold”, or “intervals”. And this is the stuff that adds lean muscle to your body, boosts your metabolism and gets you fit fast – compared to a slow and sluggish slog in your “fat-burning zone”. This is not negotiable by your body. It is simple physiology. When you deplete muscle glycogen, there is a directly proportional increase in muscle fatigue, and also an increase in muscle catabolism (direct metabolism of your body’s own muscle protein, or conversion of that protein into glucose via gluconeogenesis). Many people on a low-carbohydrate diet simply stop exercising, because it can suck so much.
6. As you lose muscle mass, your already handicapped metabolism drops even more. I will acknowledge that muscle fibers don’t burn as many calories or boost your metabolism as much as we all like to think, but this is still an important consideration for those trying to maintain lean muscle mass or tone.
7. For active people, this trouble may all be “in vain”. Since physically active individuals and athletes are far more sensitive to insulin and less susceptible to blood sugar fluctuations, any attempt to eat low carbohydrate in conjunction with exercise, for the pure purpose of “controlling blood sugar levels” could be a mostly unnecessary endeavor anyways.