What you eat shows up in your game
After working with people for a long time, I started noticing a pattern. Most people who deal with intense mental work don’t think about their digestion when they sit down to concentrate.
They think about the task, the strategy, the next move. But in the background, something else is happening that quietly affects all of that: how their body is processing what they ate.
Your brain doesn’t run on willpower. It runs on energy, and that energy depends, to a large extent, on how stable your system is throughout the day. One of the biggest factors behind that stability is your digestion.
When your gut feels calm and your meals sit well, your energy tends to stay more even. Focus comes more naturally, and thinking feels clearer. But when digestion is slightly off, the change is not always obvious. You don’t necessarily feel 'sick' or uncomfortable. You just feel… different. You might feel a bit heavier after eating, your energy can drop halfway through a long session, and suddenly your thinking just isn’t as sharp as it was before.
For anyone doing deep mental work - whether it’s chess, programming, or studying - these small shifts matter. Not because they stop you from performing, but because they gradually reduce your ability to stay engaged, patient and sharp over time.
This is where the gut–brain connection comes in. Your digestive system and your brain are constantly communicating. When your gut is under stress - from heavy meals, irregular eating or simply not digesting well - your brain often reflects that, not as a clear signal, but as reduced clarity.
That’s why two chess sessions on the same day can feel completely different, even if nothing external has changed. It’s not that you lost your ability to think — your body was just in a different state.
So what can you actually do with this?
- Avoid heavy meals right before a game (especially if they make you feel slow)
- Don’t play on extreme hunger or right after overeating
- Aim for steady energy, not big ups and downs
- Give yourself a bit of time between eating and playing
- Notice how you feel after different meals and timings
- Notice when you feel more focused and when you don’t.
See how your body responds, instead of assuming everything is just about concentration. The goal is not to control everything perfectly. It’s to understand your body well enough to work with it.
Because when your digestion is more stable, your thinking usually becomes more stable too. And instead of fighting your state during the game, you’re able to stay in it with more clarity.
