eating less..good way to kill ur productivity. I remember trying to eat much less...after a day I could only summon the motivation to just rock back and forth on a chair for hours. I was unable to do anything else.
There’s probably different ways to adjust what you eat or how to go through a day.
There must be as many combination as there are people, I had friends who switched to snacks that were harder to eat and took them more time to digest. I personally changed job for something less soul crushing, and it takes way less efforts, gimmicks and snacks to stay focused or keep a decent work rythme.