If you don't know this yet, I'll say it and spell it clearly for you:
YOUR DIET INFLUENCES YOUR PRODUCTIVITY!
A heavy lunch is a productivity killer!
If you have a heavy meal at noon you spend most your afternoon's energy digesting!
Try to think with a heavy stomach! You are simply not as effective!
So, here are some simple rules!
No alcohol or heavy meal for lunch!
Stick to something fresh like a salad, if possible outdoor!
Your lunch break doesn't need to be an hour or two!
It is better to take a short break like 15-30 min and then finish earlier to take off to the gym.
Taking a long break REALLY shifts your rhythm and it can take too long in the afternoon to reconnect with the good rhythm you had in the morning.
Have a light lunch break!