What
@Baron says holds good value. However, note should be taken
when you consume those complex carbs, as blood flow gets directed towards it's metabolism (and you want the brain to have a better flow and less active requirements). The optimal time is 1.5 hrs before your trading schedule. An aerobic workout (50% of optimal) prior to that is also very beneficial to get endorphins and other positive hormones/neurotransmitters going.
The above is the physical aspect. The psychological aspect also needs to be understood.
the first one or two trade are usually good trades. Can either be a profit or a loss but at my rules
These few words in bold (above) are very important. Just as it is important to be physically primed prior to trading, it is even more important to conserve. For instance, take a long distance runner. If he/she had the best nutritional intake prior, but uses bursts of energy to get ahead of the pack, at some point, the intake is used up and when he really needs that energy, it is not there, no matter how good he is. He just fought against himself!.
Things in the morning (opening) move big and fast. You should do everything to make your first one or two trades a winner. If things don't move your way, the faster you realize it, the better. Remove yourself from that scenario. Those who enter trades where they have to fight, fizzle out fast (think of the runner).
Opening trades due to faster and bigger movement requires more mental power; two trades (handled for over 5 min each) is enough to drop your mental productivity to lower levels. Those results are not felt by a non-experienced trader; they are shown via the PnL on subsequent trades.
There is much much more to the above and your post. You will discover it with time.