 When you don't eat enough carbohydrates, you force your body to burn more fat. However, this rise in fat burning is often misconstrued as a greater rate of net fat mass reduction on the body. But that ignores the fact that on a ketogenic diet, your fat intake shoots up as well. The question is what happens to your overall body fat balance? You can't empty a tub by widening the drain if you're cranking up the faucet at the same time. Low carb advocates had a theory, though, the so-called carbohydrate insulin model of obesity. Proponents of low carb diets, whether a ketogenic diet or more relaxed form of carbohydrate restriction, suggested that the decreased insulin secretion would lead to less fat storage, and so even if you were eating more fat, less of it would stick to your frame. So we'd be burning more and storing less. The perfect combination for fat loss or so the theory went. To their credit, instead of just speculating about it, they decided to put it to the test. Gary Taubes formed the Nutrition Science Initiative to sponsor research to validate the carbohydrate insulin model. He's the journalist who wrote the controversial 2002 New York Times Magazine piece, out of its all but a big fat lie, which attempted to turn nutrition dogma on its head by arguing in favor of the Atkins diet, with its bunless bacon cheeseburgers based on the carbohydrate insulin model. Much of Nina Ticholtz's book, The Big Fat Surprise, is simply recycled from Taubes' earlier work. In response, some of the very researchers Taubes cited to support his thesis accused him of twisting their words. The article was incredibly misleading. One said, I was horrified. He took this weird little idea and blew it up, and people believed him, said another. What a disaster. It doesn't matter what people say, though. All that matters is the science. Taubes attracted $40 million in committed funding for its Nutrition Science Initiative to prove to the world you could lose more body fat on a ketogenic diet. A contracted noted NIH researcher, Kevin Halt, performed the study. 17 overweight men were effectively locked in what's called a metabolic ward for two months to allow researchers total control over their diets. For the first month, they were placed on a typical high carbohydrate diet, 50% carbohydrate, 35% fat, 15% protein. And then they were switched to a low carb ketogenic diet, only 5% calories from carbohydrate, 80% fat for the second month. Now both diets have the same number of daily calories. So if a calorie is a calorie when it comes to weight loss, then there should be no difference in body fat loss on the regular diet versus the ketogenic diet. If Taubes was right, though, if fat calories were somehow less fattening, then body fat loss would become accelerated. What happened instead in the very study funded by the Nutrition Science Initiative was that body fat loss slowed upon switching to the ketogenic diet. Wait, why do people think the keto diet works if it's actually slowing fat loss? Well, if you just looked at the readings on their bathroom scales, the ketogenic diet would seem like a smashing success. They went from losing less than a pound a week on the regular diet in the two weeks before they switched to losing 3.5 pounds within seven days after the switch to the ketogenic diet. But what was happening inside their bodies told a totally different story. Their rate of body fat loss was slowed by more than half. So most of what they were losing was just water weight. The reason they started burning less fat on a ketogenic diet was presumed to be because without the preferred fuel carbohydrates, their body started burning more of its own protein. And that's exactly what happened. Switching to a ketogenic diet made them lose less fat mass and more fat-free mass. They lost more lean mass. That may help explain why the leg muscles of crossfit trainees placed on a ketogenic diet may shrink as much as 8%. The vastus lateralis, your biggest quads muscle in your leg, shrunk in thickness by 8% on a ketogenic diet. Yes, the study subject started burning more fat on the ketogenic diet, but they were also eating so much more fat on the keto diet that they ended up retaining more fat in their body despite the lower insulin levels. This is diametrically opposite to what the keto crowd predicted, and this from the guy they paid to support their theory. In science speak, the carbohydrate insulin model failed experimental interrogation. In light of this experimental falsification of the low carb theory, the nutrition science initiative effectively collapsed. But based on their tax returns, not before Tabs and his co-founder personally pocketed millions of dollars in compensation.