My submission is, that a healthy body – liver, pancreas, kidneys – know how to maintain the right balance and produce or dispose of fuel, either glycogen or ketones as needed. I disagree that glucose is the favorite fuel, it is only the easy fast fuel for the body, which has one great advantage – PERFORMANCE! Both muscle and brain, fast performance is fueled by carbs. But, for ENDURANCE, it is ketones which are the best fuel, and moreover, burning ketones leaves less waste to be disposed off. I think that for athletes, the challenge is how to find the right performance-endurance balance.
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Studies found that endurance performance, whether it was anaerobic or aerobic was impaired or maintained with a ketogenic diet. This is still a complicated area to study, since majority of studies used in this review had small sample sizes, no control group or were very short in duration (no more than six weeks). Because of this, it is still unclear whether endurance performance is enhanced or impaired with a ketogenic diet.
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First of all, I can’t deny the fact that people will lose weight on a keto diet. Here’s why. First of all, you’re eliminating a major food group. When you do that, you limit your food options and most likely your food intake, so it’s not rocket science that you’ll likely lose weight. Second, most people on a low carb diet tend to increase their protein intake in the absence of carbs and there is some evidence that consuming higher amounts of protein may have some weight loss benefits. The large recent study mentioned above also looked at fat loss and found that individuals following a keto diet lost about the same weight as individuals following a different diet when they ate the SAME amount of calories. However, the studies found that individuals on the keto diet tended to lose body weight quicker.
I understand your reservations on this diet (I was once the same way), however I encourage you to take a deep look into the mechanisms of the diet, and maybe give it a try for yourself. Give it 90 days. Read any number of books on it with an open mind (Keto Clarity is a great one and is a quick read) and perhaps you may find it challenges you to second guess the dietitian dogma that is pushed by the AND.
Our bodies run well on glucose (carbs)–they give us the necessary energy we need to function on a daily basis. When our body doesn’t get enough glucose (either because we’re cutting carbs too low, OR we haven’t eaten in too long), our body kind of freaks out and looks for other forms of energy to satisfy that role. That’s where the fat comes in. Without carbs, our insulin levels drop and fat is released from our cells. The fat overwhelms the liver which turns it into ketones, our body’s second choice to carbs for energy.
The keto diet is high in fat, moderate protein, and low in carbs. You will avoid foods that are high in carbs, including some fruits and vegetables, most vegetable oils (like canola and corn oil) sugar, and grains, to name a few. Instead of going over all the foods to avoid, it is easier to print the keto grocery list pdf at the bottom of this post and stick to those keto foods for simplicity.
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A study of 39 obese adults placed on a ketogenic very low-calorie diet for 8 weeks found a mean loss of 13% of their starting weight and significant reductions in fat mass, insulin levels, blood pressure, and waist and hip circumferences. Their levels of ghrelin did not increase while they were in ketosis, which contributed to a decreased appetite. However during the 2-week period when they came off the diet, ghrelin levels and urges to eat significantly increased. 
While I admittedly struggled after going off the diet (they have some high protein, low carb,good tasting premade foods that I no longer had access to) with what to eat, I at least had better knowledges of HOW to eat and have been able to maintain my weight loss since. For the first time ever, I realized that I couldn’t eat the “food pyramid” suggested amount of carbs if I wanted to maintain a healthy weight. I even began running because I was thin enough to do so. What people who have never been fat before don’t understand is how much being fat holds us back from trying new things. If only there was a way to get people to quickly and easily lose the weight so they could be successful at dieting and discover such things (tongue in cheek).