It's a pretty sound theory actually. The human animal provably goes through phases during the day. We wake up, we're hungry, we work or work out, we eat some more, we get tired, we go to sleep. To believe we're in complete control over all of our bodily functions is utter fallacy and one that puts you at risk of many stress related injuries, you really should pay attention to the animal as it is also you, after all.

Optimizing your timing and meals around your workout is a good way to make sure you're not just wasting energy. Sure you won't get any fatter, but you won't lose any visible weight either. The body has to be under strain when there's nothing immediate to use for fuel, it's forced to break down the complex hydrocarbon chains that the fatty acids are stored in around your body in the form of fat and to burn those instead of being hopped up on sugar or caffeine, that's really cheap energy that breaks down amazingly fast but is also wreaks complete havoc on your natural daily ups and downs with regards to energy.