Which is Better: Exercising Before or After Breakfast?

By , and Tanya Jolliffe
If you're an early-morning exerciser, it may seem difficult (or downright impossible) to find the time or desire to eat breakfast before a pre-dawn workout. It's already tough enough to wake up for that 6 a.m. boot camp or three-mile run, much less carving out an extra hour to prepare, eat and digest a meal.
Some people prefer to sweat on an empty stomach, while others may get dizzy due to low blood sugar. Research findings are mixed. A study published in the British Journal of Nutrition found that people can burn up to 20 percent more body fat by exercising before breakfast, but other experts claim that depriving the body of fuel before a workout can result in a loss of muscle mass.
Ken Immer, the chief culinary officer for Culinary Health Solutions, maintains that the before-or-after breakfast decision should hinge on the energy requirements of each individual. "People are very different. Some bodies work better when relying on stored energy, while others need newer fuel for the best performance," he says. "I believe that it's never a good idea to exercise on a full stomach, so the timing is a crucial element."
Health and wellness coach Lorraine Miano advises against exercising without fuel. "The downside to fasting before exercise is that you may burn muscle along with fat if you haven't had a meal," she warns. "Without some fuel, you may burn less calories if you are lacking energy and can't give it your all."

5 Questions to Ask Before Choosing Breakfast 

When Immer is working with a client who is planning a strenuous morning workout, he steps them through the following questions:
  1. What time is your workout, and are you a morning person? Is it generally easy for you to wake up?
  2. Do you currently eat breakfast daily? If so, what do you eat?
  3. Would eating breakfast before exercise cause any issues with your schedule or impact your ability to fit in your workout?
  4. Do you like smoothies and/or juices? Do you have the equipment to make them easily?
  5. Is there a restaurant or food store on the way to where you work out that is convenient and budget-friendly?
For those who are doing a less strenuous workout that doesn't require as many calories, Immer recommends basing their breakfast decision on the timing of the rest of their day and how they feel during the activity. "It's also important to consider the goals for exercising, whether it's weight loss, training for a competition, weight maintenance or just for fun," he points out.

What Happens When You Exercise on an Empty Stomach? 

During exercise, the body normally uses free sugars from cells and circulating blood sugars as its primary source of fuel. When you exercise on an empty stomach, the free sugars are depleted very quickly. In the absence of free sugars, the hormone glucagon is released, which initiates the release of free fatty acids from fat stores, a process known as lipolysis. Although more fat is used after hours of fasting compared to workouts following a meal or snack, most people may find it difficult to exercise as long or hard as they do when they have eaten recently. This may mean that you don't burn any more total calories, which may negate the fat-burning benefit.
The question of whether to eat before or after exercise comes down to understanding the best way to achieve what priorities are most important to you. "For example, if you are someone who needs to eat before exercise and you have a hard time just getting up early enough for the workout, adding in breakfast time may not be an option," says Immer. "So, perhaps not working out in the morning is the best option, which makes the before-or-after breakfast question a moot point."

Pre-Workout Breakfast Tips

  • Plan ahead. When you prepare a healthy breakfast the night before, you won't have to fumble for ideas and ingredients while your brain is still waking up.
  • Keep it light. Registered dietitian Mandy Enright, creator of Nutrition Nuptials, advises her clients to have a small amount of food before a morning workout, such as a handful of cereal, small piece of fruit, yogurt or a small probiotic smoothie. "This won’t create an overly full stomach before a workout, but will provide adequate energy to kick-start the body."
  • Keep reinforcements on hand. If you plan to work out after only a light breakfast (or none at all), keep a carbohydrate gel or sports drink handy in case you begin to feel lightheaded. Be sure to eat a nutrient-rich and well-balanced breakfast once your workout is complete.
Do you notice a difference in your workouts when you eat (or don't eat) breakfast beforehand? What do you usually eat before exercising?

Updated by Melissa Rudy, 1/3/2017

Click here to to redeem your SparkPoints
  You will earn 5 SparkPoints


KRISZTA11 3/26/2018
I started to exercise regularly in June 2011, and ever since I have always done my workouts on an empty stomach, first thing in the morning, without any problems. I have a nice large breakfast after exercise. Report
SUSANBEAMON 10/23/2017
Really study those questions and don't rag on someone who gets different answers. Can't tell you how many people I don't talk to any more because I don't do morning exercises. I don't do mornings either. Report
LOSER05 10/16/2017
thanks. Report
BLONDWUNN 10/15/2017
I'll just eat a small amount before exercising. Report
AQUAGIRL08 10/15/2017
I eat light before I exercise then eat again after. It keeps me from feeling dizzy while exercising yet I don't feel like throwing up from too much food while exercising. Report
ETHELMERZ 10/15/2017
Do what you want, when you want...... Report
I can't eat breakfast before an early morning run, it makes me want to hurl on the run itself! I generally have a bowl of porridge or an omelette after my runs and that seems to work fine. Report
ALUKOWSKY 8/14/2017
Well, I NEED to eat breakfast! Also, I have to get up between 5-5:30 AM to take care of the horses before driving 1 hour to work, so it's not possible for me to work out in the morning. Because my husband works nights and is usually sleeping when I return home, the most sensible time for me to either work out or go riding is early evening. Report
Working 40 hours a week, it is necessary for me to workout in the early morning. I generally rise about 2 1/2 hours before I have to leave for work just to have the time to cram in the one hour of exercise. This does not allow me to eat first, since it takes food time to digest before comfortably exercising. I'm too tired at the end of my work day to exercise, even though I have a desk job. However, I am starving as soon as I wake up, which makes exercising without food a challenge, and I do feel weak. Perhaps I should just grab a piece of fruit first.
I exercise at 5:30am and do not eat breakfast before. Report
I am never actually hungry when I first wake up, and I learned early on that if I eat breakfast before I exercise I will probably throw up. Not good. I generally exercise soon after I get up, and when I get home I shower and dress, and then fix myself a light but protein packed brunch. Report
I usually don't work out in the morning but on those days I must get it done early I find that having a light breakfast helps me get through my workout with more energy. I usually have 1/2 banana or 1/2 serving of cereal with milk. Report
I'm still not clear on this. I work out before breakfast and I'm fine. But I'm not awake long enough before I workout to realize what's going on. Completely different story on the weekends, I eat then wait about an hour and then workout. Report
I try to work out before breakfast so begin with a large (24 ounce) glass of warm lemon water and a piece of fruit before my workout which generally lasts up to an hour. However if I am feeling over tired or extra hungry when I get up, I'll eat my usual breakfast and workout later. Being retired I have that flexibility most days. My preference is to get my exercise in before eating and that has usually worked for me. I always have my water bottle on hand too, during a workout and it's usually empty by the end. Report
I've been drinking one good cup of coffee--espresso with skim milk & sweetner to wake up and get my wits about me. Then I do 45 minutes of cardio with Just Dance and work up a really good sweat. I wear wrist and ankle weights and do a continuous shuffle. Then I eat a 1/2 a cup of black bean tofu hash, Dr. Ludwig's recipe with a bit of avocado, salsa, and sour cream. I have no idea if this is the best thing to do, but it feels comfortable and it fits in with my willingness/ability etc. SO unless something a lot more specific turns up, I'll keep doing this. I'm sure they always say doing somethign is better than not doing something! Report
Cannot workout after a recent meal. I become very nauseous. It must be at least a 2 hour wait. I also cannot drink any water while exercising. Report
Cannot workout after a recent meal. I become very nauseous. It must be at least a 2 hour wait. I also cannot drink any water while exercising. Report
I cannot work out before eating, not even if I drink a fruit-yogurt smoothie right before. I am just too hungry and also too groggy-I need some wakeup time to be functional. Because of my Meniere's Disease, I often don't take a shower until late morning or even afternoon because of balance problems. If I am not awake mentally, my physical balance can be even worse. Report
I mostly workout early as it is the best part of the day. I go for a walk and then home for breakfast.
Usually I do some strength training before breakfast. After breakfast I do cardio. Report
I cannot workout in the morning before breakfast, I feel dizzy and weak. Actually, I have to eat something even if I wake up very very early, and everyday before going to work. Skipping breakfast has never been my problem! Report
Working out after breakfast works for me. I feel I have more energy than if I didn't eat anything. Usually, I try to eat within the first hour of waking and then do my workout an hour or so after eating. Report
I have to be up for a couple of hours before i eat or i get sick. I take my shower and leave for work after exercising and since i get motion sickness after exercising all i can do is have something to drink until i get to work Report
I find that this works for me. As soon as I wake up I have an apple or a banana. Then continue to prepare for the day. Dishes, meal arrangements, set out clothes e.t.c. After about 20 minutes I begin my workout which lasts anywhere between 45 - 75 minutes. Shower right after workout and then healthy breakfast. If I have done weight training or need a long bath then immediately after workout I have a protein shake. and regular breakfast after shower.
Alternatively if it is my light workout day just 25 minutes on the treadmill then I can do that without a fruit before. Report
I work out better on an empty stomach. If I'm hungry, I'll eat something light - a banana, apple, or if I'm low on carbs I'll have some toast or something... but much more than that and I feel like I can't get a good workout in. I workout in the AM 2-3 times a week and in the PM 2-3 times a week and at all times I prefer to not eat anything a least 3-4 hours before. However, there have been times when I've felt lightheaded doing this. I think you learn to gauge yourself and how you feel before a workout. If I wake up hungry, I eat before a workout. If I'm so hungry I eat more than a little snack, I work out lighter. It's all about safety while you're getting your healthy activity in! Report
Whenever you possibly can carve out the time! In this busy world we do what we can WHEN we can! Report
For me, I have tried both ways but find i do better with some food in my stomach before i exercise. Sometimes i will eat a protein bar before hitting the exercise routine which also helps. But i am not one to rise in the middle of the night to start exercising! Report
I cant exercise after I eat...for some reason if I eat early in the morning and then go out to run, it makes me really sick where I can't finish my run...so what I do it my strength training first then drink milk with chocolate and go out for my run. I make sure I drink a lot of water and my green tea before hand but to eat food would just ruin it. I exercise three times a week early in the morning and that has been my route since the second day because the first day I got sick and didn't even finish so not eating for me works but i would think it depends on the person, some can't exercise without eating first and others can, I say do you what makes you feel good and keeps you on track Report
I exercise between classes, so I end up eating a banana in class 1, some cheerios/almonds in class 2, working out for an hour, and then eating lunch an hour or two later in another class or back at home. I've sort of lost the concept of three meals a day, what with my day being so segmented. The bottom line for me is that I like to eat something beforehand if I can space it about an hour before my workout. I can't eat and then immediately run, or I feel gross. Report
I drink some milk, with or without tea, before I exercise just to fuel me through my morning workout. Right after working out I'm not hungry, so I shower and then eat breakfast. Report
I just start working out at the gym but I have to eat something before I work and as soon as I finish working out I have to have a snack Report
I've never been much of a breakfast eater. I almost always exercise before eating. I never have any problem with dizziness. If I eat before exercising, I feel full and lethargic.

I didn't have a choice in the matter when I was in the Army - it was morning PT at 6 am, 5 days a week for most of my 4 years. And the mess hall wasn't open early enough to eat before PT, so you did PT on an empty stomach.

Now that I'm getting myself back in shape, I find that I need to follow that same routine, except now I have to get out at 5:00 am. There's NO WAY I'm getting up any earlier than I have to; I do C25K on a few sips of water (don't want to slosh or need a pit stop). So far, so good.

I don't always do this; some days I work out in the afternoon. Some days I do both, like today. I do try to make sure I have something at least 1/2 hour before I do afternoon sessions. Report
I eat a bowl of cereal for breakfast, putz around for half an hour checking my emails and what-not, and then go exercise. I get hungry if I don't and I feel like I can exercise harder if I have some food in me, but I have to let it digest a little before I go work out. I also drink a glass of water during that "putz" time. If I'm dehydrated when I work out the WO is always a lot more difficult for me. Report
I'm definitely a morning person when it comes to exercise. I actually hate eating before I workout. I'm usually NOT hungry when I wake up, so I just skip it. But I do try to eat a solid breakfast as soon as I finish my post-workout shower. Report
I work out pretty early in the morning so I'm usually not hungry before working out. If I feel like I do need something I usually eat part of a powerbar. Report
Like another commenter said, I usually have a glass of apple juice or banana or something with instant sugar before my morning run. If not, I get dizzy quickly. After, I have a protein bar or protein shake. It's a balance to get it right - if I have a protein or energy bar beforehand, I usually get a stomach ache when I run. If I have nothing before, I get dizzy and lightheaded - and then feel bad b/c I haven't performed well. I try not to give myself built-in excuses like not having fuel before working out. Report
I will usually have juice or a shot of honey if I'm exercising in the morning. That way I have a little something in my system and my stomach isn't upset. Then I eat a real breakfast after I workout. Report
I am in the minority here because I usually work out before breakfast. Funny thing is the rest of the day I do feel weak and lethargic if it has been more than several hours since I ate but first thing in the morning I am full of energy. After my workout I'm ready for breakfast though! Report
I run at 5:00 am most days and try to at least have a banana. Anything else will upset my stomach. Report
I have to eat before a workout, as an instructor it is important that I challenge not only myself but members. If I workout on an empty stomach I feel weak and
sometimes dizzy. But this is also true when I eat something heavy before a workout . It seems like I have less energy and get nuasested. So I stick to yogurt about and hour or 2 before a workout. I also need to eat about 2 hours after a workout or I feel tired. Report
This is the main reason i don't work out early in the morning. I am one of those people who needs to eat breakfast so that i don't get dizzy/faint or ill. i have not been willing to get up early enough to eat breakfast first. i really wish i could, but it has never worked for me. i do like to have a small snack 1/2 - 1 hour before running or working out. Report
I am borderline diabetic so eating before I work out is very important. Without breakfast I become very dizzy. Report
I definitely notice a difference in a hard workout if I haven't eaten before. I have to have breakfast if I'm going to work out to my full potential. It doesn't matter as much if it's a less intense workout, such as walking, for me, but I think it's better to eat first. Report
I feel that you must eat breakfast first; your body requires sustenance after fasting thru the night. Report
I don't do morning workouts usually, but I always pay careful attention to my food intake before and after my workouts. I make sure I get a boost of carbs beforehand and some protein in whatever I eat after. If I time things right, I can make my body feel great during my workout and feel refreshed long after too! Report
I don't usually work out in the mornings, but regardless of the time of day I exercise, I always prefer to eat something before I go. As long as it's light it doesn't bother me to eat immediately before exercise or even during a break, and I can work out much more intensely when I'm not hungry! (Being well-rested and having had my coffee help a lot, too.) Report
I exercise before I eat breakfast for 2 reasons: 1) if I don't get out and exercise within 15-30 minutes of getting up, I'm not exercising; 2) my dog needs to relieve himself and walking lets him take care of his business as much as he needs to. I'm not hungry that early in the morning (6-6:30 am). I usually drink 16 oz of water before we walk and eat later.
I eat a Trader Joe's cereal bar as I'm heading out the door before my morning walks. It's just what I need and gives me the right amount of energy. Report
I agree with GREENEYES_78. For most exercising I will at minimum drink a protein drink before exercising. However, if it is yoga, I will exercise first as the positions one must get into to can are not exactly comfortable if food is jostling around in one's stomach (and one can't exactly relax if one is afraid they are going to up-chuck). Report
Close email sign up
Our best articles, delivered Join the millions of people already subscribed Get a weekly summary of our diet and fitness advice We will never sell, rent or redistribute your email address.

Magic Link Sent!

A magic link was sent to Click on that link to login. The link is only good for 24 hours.