So if we can make a connection between the types of food injested and mood, then we should look at this closer. Mood plays a big role in decision making. It will also have an impact unto your daily meditation or any other spiritual/magical practice.
Something for you consideration, given the plethora of dietary regimes that are available to you for a price, is simply, what did your ancestors eat?
Asians grew and consumed rice for thousands of years, and still do to this day obviously. What is the percentage of Asians that have diabetes? Heart disease?
Another fact worth considering is that they were close to their food source. It wasn't manufactured by some company you don't know much about, by people you will never know.
This plays a serious role in not only the quality of the food, but even the spiritual aspect of consummation.
Consider your food sources.
Consider your food types in regards to your predominant ancestry.
Experiment and figure out what works for you. How do you feel after the meal?
The goal is that of health. If you eat a meal that makes you feel lethargic and sleepy, well that's a bad signal.
Eat to live, do not live to eat.
The Individual is Paramount,
As Within so Without