There are some food items that you can eat more before exercising such as anything that has carbs. Peanut butter and a banana sandwich can be a good snack before you work out. It will provide you with enough carbs and sugar to do the various exercises that you should do. You can also eat nuts and raisins.
A handful will be just fine. For post work out meals, you need to find meals that will replenish the nutrients that you have lost. You can drink low-fat chocolate milk. You may also eat low-fat yogurt that you will be mixing with berries so that you will still have enough strength to continue the rest of your day.
Your pre-workout meals are foods that can give energy. Talking of energy, you need to eat enough carbs to fuel your engine. While this is important, you must also know when you should eat before you start working out. Although this depends on your body, you should eat 2-3 hours before pre-workout. Examples of pre-workout meals are Greek yogurt with berries, nuts, and raisins, Apple and almond butter, oatmeal, etc. The reason why the list also includes some protein is to help you repair and rebuild your muscles. Nevertheless, you need more carbs for pre-workout. Your post-workout meals should also contain more carbohydrates and protein. This will help your body regain the glycogen used by your muscles while working out, and the protein for muscle repair and rebuild. Examples of post-workout meals are trout with sauteed spinach and baked sweet potato, white pita with grilled veggies, boiled eggs, and wheat toast, etc.