Visualization training helps athletes to mentally prepare for competition. The process of visualization includes imagining success, focusing on goals, perfecting skills, and increasing one's ability to focus on the task at hand.
Hope this helps
I agree with the answer above and would like to add on to it. When looking at nutrition labels you should be looking at what ingredients was used to make the food, including the chemical compositions. For an example, some people are allergic to peanut butter, therefore it is their responsibility to check the label so that they know what company made it and the ingredients. Also remember to check the expiring date :D
I suppose you mean proper nutrition. Main function of digestive system is to break down food and turn it in to energy. You have most probably heard about calories. So, 1 gram of Protein is 4 kcal, 1 gram of Carbohydrates is 4 kcal and 1 gram of Fat is 9 kcal. (also let's not forget that 1 gram of Alcohol is 7 kcal) Average male needs about 2000 to 2500 kcal a day to function properly (it's slightly less for females it depends on bodyweight, amount of muscle mass and activity level)
Along with water those are Macronutrients (carbs,protein and fat).
Micronutrients are vitamins and minerals essential for your body. For example Vitamin C, Iron, Zinc...
Now, proper nutrition is balanced diet filled with vitamins, minerals, quality sources of protein, carbs, fats and also filled with right amount of fiber which plays a vital role in your digestion by helping you with bowel movements and even lowering your blood cholesterol levels. So basically proper nutrition is connected to main function of digestive system in a way that by supplying your body with everything it needs, giving you right amount of energy it also keeps your whole body healthy at the same time.
