“Breakfast is the most important meal of the day!”

Is that true?

Seems like a lot of pressure on breakfast, especially given that every meal is an opportunity to nourish our bodies with delicious and nutritious foods.[1]

Sure, one large analysis found that people who ate breakfast had lower rates of heart disease, diabetes, high blood pressure, cardiovascular issues like high blood pressure or strokes, or high cholesterol.[2] 

But we don’t know if skipping breakfast caused this or if skipping breakfast was just part of an overall unhealthy lifestyle.

So, should you be worried? (Spoiler alert: we recommend never worrying or “shoulding” yourself about your nutrition — rather, just focus on making wise, mindful choices to take good care of yourself.)

The good news is that there are many ways to time your eating and fasting for good health and weight loss. 

Depending on your intermittent fasting schedule, you might skip breakfast as part of your daily routine. Or a few times per week. Or never. 

Let’s take a look at the pros and cons of skipping breakfast so you can decide whether it’s something you might try (or continue to enjoy if you already do it!).

Feeling unsure about skipping breakfast? Take our Simple quiz to find the perfect rhythm tailored to your lifestyle. Let’s help you determine the most efficient eating and fasting windows to boost your health.

How your circadian rhythm affects your metabolism

Our circadian rhythm is our daily cycle of sleeping and waking.

Emerging research suggests that our circadian rhythms organize most processes in our body, including our metabolism, blood sugar management, digestion, and appetite.[3,4,5]

So, by taking advantage of our circadian rhythms, we can align with our body’s natural timing to help ourselves stay healthy, regulate our metabolism, and lose weight more easily.[6]

Metabolically speaking, there does seem to be an advantage to eating the bulk of our food earlier in the day.[3,7]

But it doesn’t have to mean eating immediately after waking up. 

If your goal is to lose weight, there’s limited evidence that eating breakfast magically “kickstarts” your metabolism or provides any special advantage for weight loss.[8]

Thankfully, your metabolism works just fine when you wake up in the morning. Otherwise, how could you function without reaching for a bite of food from the comfort of your bed? 

Let’s look a closer look at the pros and cons of skipping breakfast.

The pros: when skipping breakfast might be helpful

You wake up in a fasted state

Let’s be honest — we all want fasting to be easy, right? And one of the best life hacks for fasting is to include those eight hours of sleeping, which means that all we have to worry about is a few extra hours of fasting while we’re awake.

After about 6–10 hours without food, we move into a fasted state.[9] This means our bodies shift from using whatever we ate in our last meal to using stored body fat for fuel.

Since you’re probably not eating while you sleep (or so we hope), by the time you wake up, you’re likely in a fasted state.

Assuming you’ve had at least eight hours of sleep, morning time is the most fasted you’ll be all day. Insulin sensitivity is at its highest, and your glycogen levels are at their lowest in this fasted state.[10] 

Cool — now you can take advantage of this!

Overnight, you don’t have to deal with hunger or boredom. If you eat an early dinner and skip or delay your breakfast until 10 AM or later, you can quickly meet the requirements of a 14- to 16-hour fasting window. 

When you extend your morning fasting window a bit longer, you can increase the benefits of fasting, which extend beyond weight loss. 

You’re naturally not hungry in the morning

Say “big breakfast” to some people, and they’ll make a “yuck” face. For some folks, early morning eating is just … gross. Their bodies do not want food in there first thing.

If that’s you, the good news is you can just vibe with your body’s natural preferences and eat later in the morning or around noon when you feel ready.

You do low-intensity exercise early in the morning

Love those sunrise walks or yoga practices? Then skipping breakfast and doing them fasted might be ideal for you.

If weight loss is your goal, the morning hours are a convenient time to add exercise to your daily routine. When you forgo breakfast, you’ll have extra free time in the morning.

And some research links exercising while fasted — particularly low-intensity, relatively easy exercise like walking — with helping you burn more fat, improve your response to insulin, and lower your risk of diabetes and heart disease.[11,12,13] 

You have shared meals or social events later

Maybe the only time you can share a meal with your partner is later in the evening after you both get home from work. Maybe you have a fabulous evening party to attend.

Whatever it is, you might have times when you want to eat later. 

Starting your eating window later in the day by eliminating a morning meal gives you that flexibility. When you pass on breakfast, you can enjoy social time with friends and still stick to your intermittent fasting schedule. 

Just make sure your nighttime meals are nutritious, and don’t eat too late. 

You want to eliminate a daily meal

Intermittent fasting is a simple idea: often, it just means eliminating 1–2 meals at the start or end of the day.

And, to lose weight, we have to eat less energy (i.e., fewer calories) than we burn. Dropping a meal out of the daily roster is a simple way to do this.

If you don’t care that much about breakfast, feel free to put it on the chopping block. But be sure to make up for that lost meal by making your other meals as balanced as possible with a good amount of lean proteins (e.g., chicken, fish, eggs, and tofu), fruits, vegetables, healthy fats (e.g., avocado and olive oil), and complex carbohydrates (e.g., brown rice, quinoa, and sweet potatoes). 

Remember, it’s not just about when you eat, but what you eat. Dive deep into the Simple app’s food journal and receive expert analysis of your meals through our Nutrition Scores feature. Plus, get handy tips on improving your food choices. Get started by taking the Simple quiz now.

The cons: when skipping breakfast might NOT work for you

You overeat later

This is the big one. 

Imagine it’s 11 PM after a long day, you’re flopped down on the couch in front of your favorite true crime show on Netflix, and your brain is telling you, “A snack would be fantastic right now!” 

And you agree — you’re starving because you skipped breakfast and didn’t have much for lunch. You could definitely go for something snacky!

Then, before you know it, your hand is scraping the bottom of the snack bag. Oops …

For some people, skipping breakfast is a straight line to overeating later, especially in the evening after a stressful day. If that’s you, consider having a clear cut-off for when your fasting window starts. 

And experiment with eating breakfast (or earlier in the day), especially one that includes plenty of protein and fiber, both of which will help improve satiety (fullness).

That can help you eliminate “snaccidents” while still flowing with your natural daily preferences.

You need to be “on your game” first thing in the morning

If you’re a serious exerciser or athlete, you’ll probably want to eat something before training to ensure you support performance and recovery. If you’re performing an 8-hour surgery, your patient will probably also appreciate you having some energy going to your brain.

Research suggests that some people may have less “get up and go” energy in the morning if they miss breakfast.[14]

In other words, if your day requires you to be well-fueled in the early hours, eat for that physical or mental performance, and consider starting your fast in the afternoon or early evening instead.

You’re naturally hungry earlier

Mindful eating and being aware of your body’s natural hunger cues are part of practicing intermittent fasting. So, notice your own unique physiological signals. When are you hungry?

If it’s the morning, enjoy that breakfast and, again, consider ending your eating window later on in the afternoon or early evening.

You’re missing nutrients

Skipping breakfast is associated with having a poorer overall diet.[15] But is a lack of breakfast to blame or the lifestyle habits of folks who tend to skip breakfast?

Eating a breakfast with lots of nutrient-dense foods may ensure you set yourself up for the rest of the day with sustained energy and lots of vitamins, minerals, and other good stuff. (Of course … you can also do that throughout the day with your other meals and snacks.)

You have a health condition that means you should eat regularly.

If your healthcare provider has told you that you have a health condition (such as diabetes) that means you need to eat relatively frequently (say, every 2–4 hours), then discuss any changes with your doctor and don’t just start missing meals.