Eat more fish for your health and for your brain. Fish are high in DHA which has been shown to improve your memory, vocabulary and prowess in nonverbal tasks. DHA may also reduce the risk of Alzheimer's. Fish is also a great source of protein and the Omega-3 fatty acids may be beneficial to your heart health.
Always read your nutrition labels when you are purchasing food from a store. You can make yourself aware of ingredients to avoid and also make healthier choices to add to your diet. Keeping track of food this way can ensure that you do not overeat by providing you with serving sizes.