A long while ago I went thought a massive health phase, i had vegetable soup at night and made enough to have a huge glass (or 2) in the morning, and plenty of exercise. Looking back it was actually really good, I had really good mental clarity throughout the day when I did that (coupled with nice big salads for lunch), had the energy and was able to basically focus (no mental “fog”) and be extremely productive. At a guess, i’d say i was about twice as productive as I am now.
Then I got slack, now I skip breakfast for the extra 10 minutes sleep then grab a coffee at work. Sleep like ****, eat like **** and put on about 15-20kgs
I really should get back to that for the productivity boost, hard to describe to people who have not experienced it.