Does anyone remember Public Service Announcements? They were television and radio commercials back in the 60's and 70's intended to educate and inform the general public. I'll be posting PSA's for the group during our challenge, based upon questions that pop up in our blogs, concerns and needs of our sister challengers.
Disclaimer: I am not a doctor, nutritionist, or fitness guru. I am sharing what I've learned through research and experience; you all must use your own judgment in deciding what is best for your and your own health, including checking with your doctor before beginning any exercise or dietary program.
Julie polled her readers about eating before or after exercise. Are you supposed to eat before, during or after exercise?
The answer is Yes.
First, the science behind it. Your body is an amazing machine, and it works constantly to maintain a certain level of glucose in your bloodstream. Glucose is fuel - it keeps you going. Your body changes the food you eat into glucose to power your pretty self. Once your bloodstream is saturated at the proper level, extra glucose is stored in your liver as glycogen.
When you exercise, your muscles go into overdrive, drawing glucose from your bloodstream. Once that source is used up, your liver will change the stored glycogen back to glucose and release it into your bloodstream to keep you moving. Once the liver glucose is used up, your body will start using stored fat to make more glucose for your muscles. Unfortunately, changing fat to glucose is a slow process, much slower than the rate your exercising muscles are screaming for fuel. If you get to this point during a workout session, BAM! You hit a wall. You start to shake, feel light headed and break out in a cold sweat. You just can't keep going.
What? Isn't the purpose of exercise to burn up fat? Why yes, it is! Just not DURING the actual exercise. Your body can't convert fat to glucose fast enough to support exercise in the moment that you are actually moving. Fat burning takes place once you stop. Remember how your body keeps a constant level of glucose at all times? Once you've depleted the glucose in your body and stopped actively exercising, your body will pull from your fat reserves to balance the glucose level in your bloodstream and to recharge your liver.
You need to fuel your body for working out - give it some fast easy energy that your muscles can pull straight from your blood stream, because they NEED that fuel to function! This doesn't mean a full meal - this means a snack, preferably one with a balance of carbohydrates (fast fuel, converts quickly to glucose and floods the muscles) and proteins (slower fuel that will hit the bloodstream about the time the carb rush gets used up).I usually have 1/2 of a peanut butter and banana sandwich before I exercise.
For really long workouts, like runs or long bike rides, you need to top off the glucose fuel tank during the exercise to avoid that muscle crash. Some folks swear by those little gel things; I prefer real food. I'll carry an apple or a granola bar with me and have a bite or two every 30 minutes. Again, not a full meal or complete snack, but just enough to keep the fast fuel coursing through my bloodstream for my muscles to pull from.
It's also important to have a snack after working out that's a little higher in protein in order to give your body materials to repair muscles and to do it's work replenishing your blood stream and liver from your fat reserves. I usually have a few slices of turkey or a piece of cheese. Some serious runner friends of mine swear by chocolate milk for after run recharging.
There are hundreds of opinions about fueling for working out, and every body is different. You each need to figure out through trial and error what works for you - what lets you get through a workout without collapsing, but still keeps your body burning fat afterward.
Keep the Faith.