Because of a significant change in your body's chemistry when on a low Carb diet, certain metabolic pathways are turned "on" that are normally not "on" or run at very low levels. One such pathway involves the breakdown of fat, called Beta-Oxidation of Fats.
Now, normally fats are broken down to produce energy when your body senses a need. But in the context of a low Carb diet, the normal breakdown pathway of fats is altered and an alternative pathway kicks in. This alternative pathway produces what are called ketone bodies.
Ketosis is the term used to describe when ketone bodies are circulating in your bloodstream. The ketone bodies can be used as alternative sources of energy by, most importantly, your brain.
In case you might be curious, the three ketone bodies produced by this alternative pathway for breaking down fat are acetoacetate, beta-hydroxybutyrate, and acetone. These ketone bodies are formed in your liver and then are transported to other tissues, mainly the brain. In your brain, they are converted back to a form that can provide direct energy during times of starvation.
Here is the whole process...
So, the Atkins Diet (and any low Carb diet) produces a low energy state (low glucose) that causes the breakdown of fat using an alternative pathway that leads to the development of ketosis.
So far the Atkins Diet sounds pretty good. By limiting Carbs in your diet, you can essentially force your body into breaking down stored fat, the very thing you need to get rid of to lose weight.
But there are problems...
Atkins Diet and Toxicity
Ketone bodies are toxic. Many supporters of low Carb diets claim that ketosis is safe. They state that ketone bodies are natural by-products of fat breakdown and even babies have high levels of circulating ketone bodies.
First, they are not natural by-products of fat metabolism. The normal beta-oxidation of fats does produce ketone bodies but these are incorporated into the normal cycle of energy production, called the Krebs cycle. When ketone bodies are circulating in your bloodstream, it signals an abnormal physiologic state, called starvation. They are not incorporated into the normal energy cycle, the Krebs cycle, and the ketone bodies spill into the bloodstream.
Just because your body has the ability to transport ketone bodies to certain tissues and then use them for energy, does not make it a normal process. It is an alternative pathway that turns "on" only when your body is faced with depleted levels of the main energy source, glucose.
Secondly, babies are not small adults. A baby's liver and brain tissue are made up of different chemicals and pathways, specifically geared to handle the high fat diet coming from mother's milk. These pathways change as a baby grows and starts to eat other foods. Eventually, the normal adult pathways are set up and the infantile chemistry used as evidence to support the safety of ketosis, stop working.
But this is not even related to the fact that ketone bodies are toxic. In medicine, the three ketone bodies mentioned above are classified as toxic acidic chemicals. At high levels, they can cause your blood to become too acidic, a disease state called ketoacidosis.
Granted, this is rare because most of the ketone bodies will be used by the brain as an energy source. Ketoacidosis is usually seen in type 1 diabetics. It is a medical emergency.
So, is ketosis dangerous to your body? Yes and no. Yes, ketosis represents a state of starvation. Losing weight when the body thinks you're starving is the best way to guarantee weight regain. The weight will come back and come back as fat.
No, ketosis will not cause ketoacidosis in non-diabetics. And as long as you have a large storage of fat, your brain will not starve for energy.
The Final Verdict
Conclusion - The Atkins Diet
Atkins Diet and other ketogenic diets (low Carb) can be safe and effective in causing weight loss. However, I recommend keeping ketosis to a minimum and keep your carbohydrate intake above 50 grams a day. Don't follow the suggestions for reaching an "induction" phase. It's not necessary to reach induction to turn "on" the alternative pathways described above and burn fat.
Remember, healthy weight loss is to burn fat and fat only. But it also involves keeping your rate of weight loss around 2-3 pounds/week. The induction phase promoted by the Atkins Diet can result in a rate of weight loss far greater than 2-3 pounds/week. It may sound good to you now, but how does gaining it all back as fat sound? Because that will happen if you lose weight too fast.
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