Caffeine and trading: friend or foe?

[Shadow Trader]

Coffee before the London open is practically a tradition. Does it help or hurt?

In moderation, caffeine improves alertness and reaction time. It can sharpen focus during an early session. Overdone, it increases anxiety, jitteriness, and impulsive behavior, which is not a great combination with real money and fast charts.

The trouble is that the effects vary widely between people, and tolerance changes over time. A cup that helps on Monday might add edge to nerves on Friday after a poor night's sleep.

An easy experiment: track caffeine intake alongside trading quality for a few weeks. Rate each session's discipline and note the number of cups. Patterns tend to show up fast.

Hydration and food matter too. Skipping meals and chugging energy drinks creates swings in energy and mood that map neatly onto swings in decision quality.

A neat compromise some use is limiting caffeine to a single cup, taken at least an hour before the session, and swapping later cups for water or tea. It keeps alertness without the jitters that tend to arrive mid-session.

Does caffeine make a measurable difference to results, and what's the personal limit?