I started doing this for a few hours before lunch to extend my battery life, but found that it actually improved my attention and productivity. I also made better choices from my less distracted state, in particular deciding I could skip an unhealthy snack etc.
This is actually not a bad idea at all. Although no hope for skipping unhealthy snacks.
I use chewing gum to minimise the snacks.
I tried, but the amount of chewing gums I can, well, chew escapes reality. Seriously, I thing I could get addicted.