
7. Make decisions
If you are going to make an important decision, you need to think about it first and for your brain to work well it needs fuel. Your brain uses glucose to work well but it can’t actually store it, your brain needs a refill every four hours or so for it to work smoothly. If you haven’t eaten for four hours your brain can have a hard time making decisions. The drop in blood glucose can not only affect your ability to think coherently, but it can also raise your irritability levels. Ghrelin is produced in the stomach when it is empty to send hunger signals. Research has shown that increasing ghrelin levels make the brain to act impulsively and affect the ability to make rational decisions.

In the new study conducted on rats, the hormone has been shown to have a negative effect on decision-making capabilities and impulse control. When rats were given ghrelin directly into their brain in the same way that the stomach sends the message when it is time to eat, the rats made impulsive decisions, despite having been trained to wait for a greater reward. Making decisions on an empty stomach is nearly twice as likely to encourage you to make the wrong one compared to people who have eaten. Some research studies back up claim that low levels of blood sugar can cause the most rational people to lose their ability to think clearly and make impulsive and sometimes risky decisions. It also revealed that hunger pangs can significantly increase feelings of irritation and anger, which can also adversely affect concentration.