much more efficient than Rapid Tone Diet carbohydrates. Each gram of carbohydrate gives us 4 KCal while 1 gram of fat gives us 9 KCal ( reference ). Conclusion : Everything seems to indicate that fats are better food than carbohydrates to use continuously. But there is a problem: the brain. KETOSIS AND THE BRAIN The brain consumes 20% of our body's energy. For a long time it was considered that fats were not a good "fuel" and that they can not be used by the brain as energy for two reasons: They can not cross the blood-brain

http://supplementstest.org/rapid-tone-diet/