According to this article, science can not conclude but does suggest there is a healthy benefit to using fat in your body for fuel. It can actually improve physical performance, learning to burn your fat will also help with boosting your energy. Using the fat stored in your body for energy also help you be dependent on your own body for energy and stamina rather then something like sugar.
Key Takeaways:
- Currently, whether burning fat and ketones can boost cognitive function in healthy adults remains unconfirmed. However, evidence suggests that it can provide a benefit.
- Fat-adaptation makes you better at burning fat and less reliant on muscle glycogen, essentially, any work you put out that can be accomplished by burning energy from fat rather than glycogen is evidence of efficiency.
- Fat isn’t an instant performance boost, it’s a long game that has to be accomplished slowly, allowing the body to adapt to the new form of energy it has at its disposal.
“A few weeks back, I explored the potential benefits using fat as your primary fuel can have on cognitive function.”
http://www.marksdailyapple.com/how-using-fat-for-fuel-can-boost-athletic-performance/