The foods you eat prior to exercising can impact your workout. If you eat the wrong foods, the quality of your training will suffer because you'll feel lethargic. With that being said, here are some foods you should definitely not eat before your workout:
So what should you eat before your workouts? Go for the low-glycemic foods which won't cause an energy dip during your workout and are relatively easy to digest. Try a piece of fruit (e.g., apple, orange, banana, grapefruit, etc.), a whey protein shake, black beans, brown rice, quinoa, raisins, oatmeal, sweet potato, whole-wheat bread, whole-wheat tortilla or whole-wheat pasta. You should eat these kinds of foods within an hour of your workout. Keep in mind that the most readily available macronutrient within your body will be used for energy during your workout. This means that the macronutrient content of your most recent meal before your workout will affect what substrates are used during exercise. For example, if you ate mostly carbs before your workout, than more carbs will be burned as fuel for energy during your workout. This is important because if you're someone who wants to lose bodyfat it would be better to avoid consuming a pre-workout drink containing simple carbs. The reason for this is because the simple carbs would be preferentially used by your body for energy rather than your stored bodyfat.
BOTTOM LINE: If you're trying to lose bodyfat, the worst thing for you to do is to drink an energy drink before your workout. The sugar in the drink will be used for energy rather than any stored fat from your body. Instead, drink plenty of water before, during and after your workout. If you're trying to gain muscle mass, then it is okay to consume an energy drink before your workout for the quick energy source but be sure to eat a low-glycemic food beforehand to avoid "crashing" during your workout.
Brian Danley, CFT
"Motivation is what gets you started. Habit is what keeps you going."
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I'm a personal trainer who loves to help others fulfill their health and fitness goals. I consider myself a bodybuilder in that I live the lifestyle of eating healthy food, working out regularly, and sculpting my body.