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Should You (or Should You Not) Be Working Out on an Empty Stomach?

Should You (or Should You Not) Be Working Out on an Empty Stomach?
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As the amount of fitness information available is getting bigger, the chances of being exposed to bad advice are also growing, creating more fitness myths than ever. Yet, one of the most debatable myths that has been out there forever is the myth of working out on an empty stomach.

It has been a prevailing thought for decades that you shouldn’t eat or drink prior to working out, and it seems that only recently the public has started questioning its accuracy.

“Fasted” versus “Fed”

The common belief of the effectiveness of the “hungry workout” isn’t unsupported; actual research backs it up. The British Journal of Nutrition[1] and the International Journal of Sports Nutrition and Exercise Metabolism both published studies that show data in favor of “fasted” as opposed to “fed” training when it comes to the percentage of fat lost per workout.[2]

Additionally, a study published in the European Journal of Applied Physiology shows that fasted training provides a better anabolic post workout response to weight training, meaning it provides a better environment for building lean mass.

Namely, the conclusions indicate that “prior fasting may stimulate the intramyocellular [stored fats] anabolic response to ingestion of a carbohydrate/protein/leucine mixture following a heavy resistance training session.”[3]

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Moreover, by providing better absorption of the post workout meal nutrients, fasted training has the great potential to improve insulin sensitivity, and is, therefore, an important agent in the fat loss process.

As insulin sensitivity shows how easily fat and muscle cells in our body take in glucose, regulating insulin sensitivity helps lower the blood sugar levels, which is one of the most important factors in weigh loss. The Journal of Physiology published a study[4] that shows significantly greater insulin sensitivity improvement for the fasted training group as opposed to fed training group.

Finally, fasted training proved beneficial to endurance performance. In a study[5] published in the Journal of Strength and Conditional Research, ten professional cyclists maintained lean mass, lowered fat mass, and maintained performance.

Why fed training is better?

However, there is another side to the story that trumps the beliefs of efficacy of fasted workouts. As sports dietetics specialist Kelly Pritchett, Ph.D., R.D. explains, while the body’s response to a high-intensity fasted workout is to burn glycogen, the stored up carbohydrates, eventually, the body starts to adjust to the new system and starts storing fat from the next meal and burning less calories in order to compensate.[6]

Additionally, a study[7] published in the American Journal of Clinical Nutrition shows no benefits of fasting, since longer periods of avoiding food showed a decrease in resting metabolic rates (calories burned per unit of time, a day usually.)

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What’s more, fed training actually helps reduce appetite later in the day, as a study[8] in the journal Appetite shows. Whereas both fed and fasted training participants were expanding the same amount of energy throughout the day, the fed training participants experienced lessened appetite later on, which means less snacking or overeating later in the day, which is great news for anyone who wants to lose weight.

Although it may seem (according to scientific data) that fasted exercise provides better results, later and more extensive research shows the opposite is true.

As far as the fat burning capacity of fasted training is concerned, while it is accurate to some point, on the other hand it is proven to be counterproductive.

Namely, throughout the course of a high-intensity fasted workout, having no more fat to burn, the body starts to burn muscle instead. As another study[9] published in the European Journal of Physiology shows, during high-intensity training, without prior eating, the body relies on burning muscle proteins for energy, which is certainly an unwanted scenario for both professional athletes, and people who are just trying to shed some weight and feel better.

Another important benefit of fed training is that it gives you the ability to improve at a steady rate, which is impossible to achieve through a fasted workout regimen, as a study[10] from the Journal of Science and Medicine in Sport shows. Being able to push yourself a little bit further each time, and outperform your previous training, isn’t feasible with fasted training since your body lacks the energy to rely on for additional strength. By eating a light meal before your workout, your body will be provided with enough energy to help you perform a little better each time.

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As the study concludes, “meal ingestion prior to daily exercise can modify some of the exercise training-induced adaptations normally seen with endurance training compared to when daily exercise is undertaken in the overnight-fasted state.”

How Fed training affects fat loss

When it comes to burning fat, the results are more favorable for the fed training method. As another study[11] in the International Journal of Sport Nutrition and Exercise Metabolism shows, physical activity after a light meal is far more effective for fat loss.

The study analyzed the effect on oxygen consumption (VO2) and substrate utilization (how our bodies burn fats and carbs), estimated by the respiratory-exchange ratio (RER) in eight young healthy men who were exposed to the same moderate-intensity workout. The results showed that breakfast increased both VO2 and RER significantly, and more importantly, the difference was still significant 24 hours after exercise. This means that fed training increases lipid utilization (the breaking down of fat cells), which is essential for weight loss.

Another study[12] in the Journal of the International Society of Sports Nutrition has managed to completely refute the belief that fat loss is much faster throughout fasting training, as the results showed no significant difference in weight loss between women who ate a meal-replacement shake before working out and those who performed training without any meal.

Conclusions

All research considered, a fed workout actually has more scientifically proven benefits to overall health, fitness, weight loss, and workout performance, as opposed to fasted training. It may seem like fasted training aids in body fat loss, but in the long run, it actually has counterproductive effects, as the body starts to store fat and burn less calories as a precaution.

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Additionally, the studies show far greater and longer effects on burning body fat with fed training than those of a fasted. Moreover, the decreased appetite shown in groups who performed fed training is another reason for people who want to shed some weight to enjoy a light meal before a workout in order to prevent later cravings.

Finally, for reaching new higher goals in fitness and training, a fed workout is again a much more productive option, since the calories provide enough energy for extra effort.

Featured photo credit: Pixabay via pixabay.com

Reference

[1] The British Journal of Nutrition: Breakfast and exercise contingently affect postprandial metabolism and energy balance in physically active males
[2] The International Journal of Sports Nutrition and Exercise Metabolism: Effects of fed- versus fasted-state aerobic training during Ramadan on body composition and some metabolic parameters in physically active men
[3] European Journal of Applied Physiology: Increased p70s6k phosphorylation during intake of a protein–carbohydrate drink following resistance exercise in the fasted state
[4] Journal of Physiology: Training in the fasted state improves glucose tolerance during fat-rich diet
[5] Journal of Strength and Conditional Research: Effects of caloric restriction and overnight fasting on cycling endurance performance
[6] DailyBurn: Intermittent Fasting: Should You Exercise on Empty?
[7] American Journal of Clinical Nutrition: Alternate-day fasting in nonobese subjects: effects on body weight, body composition, and energy metabolism
[8] Appetite: Appetite, energy intake and resting metabolic responses to 60 min treadmill running performed in a fasted versus a postprandial state
[9] European Journal of Physiology: Training in the fasted state facilitates re-activation of eEF2 activity during recovery from endurance exercise
[10] Journal of Science and Medicine in Sport: Adaptations to skeletal muscle with endurance exercise training in the acutely fed versus overnight-fasted state
[11] International Journal of Sport Nutrition and Exercise Metabolism: Exercising fasting or fed to enhance fat loss? Influence of food intake on respiratory ratio and excess postexercise oxygen consumption after a bout of endurance training
[12] Journal of the International Society of Sports Nutrition: Body composition changes associated with fasted versus non-fasted aerobic exercise

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Last Updated on July 12, 2021

100 Incredible Life Hacks That Make Life So Much Easier

100 Incredible Life Hacks That Make Life So Much Easier
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Want to learn some quick and easy life hacks that are easy to do, low cost and saves you time?

By tweaking little things in your daily life, it can make your life much more convenient!

Here’re 100 of the most practical life hacks so you can just pick up any of them right away!

83 tie a small piece of bright colored fabric

    84 write random letter

      85 use a rubberband

        86 dorm smell bad

          87 lean your phone on your sunglassess

            89 how to waterproof your shoes

              90 take a picture of the name card

                91 iron inside out

                  92 old newspaper

                    93 tumble try shoes

                      keep a card like this

                        SONY DSC

                          94 soap bar

                            95 make a hole

                              96 drop the battery

                                97 use a coozie

                                  98 when taking a picture

                                    use a clean dust pan

                                      try a pants hanger

                                        use your cellphone light

                                          use a spring from an old pen

                                            quick and easy iphone speaker

                                              user binder clips

                                                wrap a wet paper towel around your beverage

                                                  put pancake mix in a ketchup bottle

                                                    clean out an old lotion bottle for your beach

                                                      use a muffin tin to serve condiments at a bbq

                                                        doritos are great for kindling

                                                          use nail polish to identify different keys

                                                            use a hanging shoe rack to store cleaning supplies

                                                              freeze grapes to chill white wine without

                                                                use paper clips to organize your cables

                                                                  almost finished your jar of nutella

                                                                    sick of having a box full of tangled

                                                                      unroll the rim to increase the capacity

                                                                        cut open toilet paper rolls and use as a cuff

                                                                          remove the stem from strawberries

                                                                            turn an old bottle into a simple little cord holder

                                                                              for iced coffee and iced cappuccino, use frozen coffee cubes

                                                                                how to fold a fitted bed sheet

                                                                                  tired of snoozing past your alarm

                                                                                    place a rubber band around an open paint can to wipe your brush on

                                                                                      ut a wooden spoon across a boiling pot

                                                                                        use bread clips to save flip-flops

                                                                                          take pictures of friends holding items

                                                                                            how i always know which headphone is the left one

                                                                                              put a stocking over the end of a vacuum

                                                                                                How to make sure you drink enough water

                                                                                                  user a can opener to open blister

                                                                                                    good sandwich guide

                                                                                                      turn your muffin pans upside down

                                                                                                        50 pounds of groceries and living on the 5th floor

                                                                                                          the right way to make a blt

                                                                                                            add one teaspoon of baking soda

                                                                                                              38

                                                                                                                hair straighteners equals to collar irons

                                                                                                                  stack your clothes vertically to see them all

                                                                                                                    the right way to make cookies in the summer

                                                                                                                      how to clean a blender

                                                                                                                        the right way to eat a popsicle

                                                                                                                          use bread clips to label and organize power cords

                                                                                                                            to get the built up residue off of your shower head

                                                                                                                              user a hair clip to orgainize long wires

                                                                                                                                a frozen saturated sponge in a bag

                                                                                                                                  rub stuck zipper teeth with a graphite pencil

                                                                                                                                    use a soda pop tab

                                                                                                                                      50

                                                                                                                                        51 How to multiply large numbers in your head.

                                                                                                                                          52 How to open a bottle if you dont have a corkscrew.

                                                                                                                                            rub a walnut on damaged wooden furniture

                                                                                                                                              kids fall out of bed

                                                                                                                                                use toothpaste to clear up hazy car

                                                                                                                                                  58

                                                                                                                                                    59 keep pizza out while driving home

                                                                                                                                                      60 put your straw through the tab to keep it from rising

                                                                                                                                                        hold oreos with a fork so your fingers

                                                                                                                                                          Never lose your remotes again

                                                                                                                                                            hiding your emergency money

                                                                                                                                                              use a bread tab to hold your spot on a roll

                                                                                                                                                                if you are at a hotel and run out of chargers

                                                                                                                                                                  keep a square of cardboard in a ziplock bag

                                                                                                                                                                    If you need to pee or smoke at a bar

                                                                                                                                                                      drill holes in the bottom of your garbage

                                                                                                                                                                        use an accented letter as your passcode

                                                                                                                                                                          use a squeeze ketchup bottle top with your shopvac

                                                                                                                                                                            do something unusual when locking the door

                                                                                                                                                                              when heating leftovers space out a circle in the middle

                                                                                                                                                                                dont burn yourself in those hard to reach candles

                                                                                                                                                                                  put a small amount of water in a glass when you microwave your pizza

                                                                                                                                                                                    75 use a piece of paper to organize

                                                                                                                                                                                      use half a pool noodle

                                                                                                                                                                                        pencil case to store cables

                                                                                                                                                                                          78 clothespin to hold nail

                                                                                                                                                                                            79 make blts

                                                                                                                                                                                              80 take a picture of your fridge

                                                                                                                                                                                                81 fill plastic water bottles

                                                                                                                                                                                                  82 right ways to eat chips

                                                                                                                                                                                                    99 if your plug keeps failing

                                                                                                                                                                                                      100 put the banana on the wire

                                                                                                                                                                                                        88 before you throw away a post it

                                                                                                                                                                                                          Source: Reddit LifeProTips

                                                                                                                                                                                                          There you go, 100 awesome life hacks that you can try right now to make your life a lot easier!

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