Fat Burning Truths
By Kelli Calabrese MS, CSCS, ACE
Okay, itís true that exercising first thing in the morning after an overnight
fast burns more fat during the exercise session. But, thereís more to it.
Fat is utilized at all times as is protein and carbohydrate. The percentages of
each that are used shift depending on our level of fitness, intensity level and
diet (including time from the last meal).
We burn a greater percentage of calories from fat at low intensities. (For
example, when we are sleeping.) As our intensity of activity increases, we begin
to burn a lower percentage of calories from fat. But, we are burning more total
fat calories, because we need more fuel to exercise than we do to sleep.
At the end of the day, it comes down to the balance of fat and energy. If, after
24 hours, you have used all of the fat you have consumed, it will not be stored
and you will maintain your weight.
Exercise is an important aid in creating caloric balance. The focus should not
necessarily be on the fat you burn during your exercise session, but the amount
burned throughout the day (along with the fat consumed).
Of the three factors (fitness level, intensity and diet) that affect the three
choices of fuel (carbs, protein or fat), intensity level makes the most impact.
At lower levels of intensity, fat is predominant. Many of our subscribers tell
me that they barely feel that they are working when they choose the "fat burner"
program on the Stairmaster or bike. The reason is that the lowest exercise
intensities burn the most fat. But, that may not be the best use of your time if
your goal is fat loss.
As exercise becomes more strenuous, carbohydrates become the primary source of
fuel. However, fat is still used. The rate of fat used is higher during
strenuous exercise, because the metabolic rate increases faster than the
percentage of fat used decreases.
If you exercise moderately first thing in the morning on an empty stomach, more
fat is utilized than later in the day when meals are consumed. An overnight fast
leaves you in a state of higher levels of free fatty acids and lower insulin
The more fat in your diet, the more you will be able to use it as energy during
moderate exercise. Keep in mind that the trade off is that a high fat diet will
not improve your performance. The more fat you eat, the less carbs you will be
able to store for energy (and then performance suffers.
The more fit you become, the better you will be able to utilize fat. So, if you
and a buddy are both on the treadmill running at the same rate and weigh the
same, but you had been regularly running for a year and your buddy just started,
you would burn more fat due to a faster metabolic rate and use a higher
percentage of calories from fat.
There are several reasons to exercise in the morning on an empty stomach, but
the bottom line is to exercise when it feels best for your body and when it best
fits your schedule. Just be consistent. Keep in mind the fat you are consuming
should be balanced with the fat and calories you are expending.
As a rule of thumb, never add fat to your diet. Thereís plenty of
naturally-occurring fat in foods. Attention should be focused on getting in
regular workouts to experience the wide range of benefits available from
exercising, including burning fat.
I hope you were able to follow along with this often misunderstood concept of
fat burning zones and timing of meals.
Kelli Calabrese MS, CSCS, 2004 Personal Trainer of the Year - Online Training.
Kelli is a 20 year fitness industry leader. She has 3 fitness related degrees
and 24 Fitness, Nutrition and Lifestyle related certifications. Kelli is the
former Lead Fitness Expert for eDiets and eFitness and remains a regular
contributor. Kelli is the author of Feminine, Firm & Fit - Building A Lean
Strong Body in 12 Weeks www.FeminineFirmandFit.com. She has transformed
thousands of bodies just like yours. She is available for phone coaching, online
training, grocery shopping tours, seminars, and media opportunities. For more
information go to www.KelliCalabrese.com
or e-mail Kelli@KelliCalabrese.com