People Who Skip Breakfast vs. Those Who Eat It: Which Group Is Less Likely to Gain Weight?

Is Breakfast "Justice" or "Old Common Sense"?

Some people eat as soon as they wake up in the morning, while others get by with just coffee until noon. Recently, incorporating 16-hour fasting or time-restricted eating, it's not uncommon for people to feel "lighter" by skipping breakfast. On the other hand, the belief that "breakfast is the source of energy for the day" and "skipping it makes you gain weight" remains strong.

An article in the German newspaper WELT addresses this old yet new question from the perspective of "metabolism." The issues presented in the public section are clear. Many people, with a coffee in hand, wonder whether they should eat or not in the morning. The choice made in the morning can affect blood sugar levels, hunger, concentration, and appetite for the rest of the day.

However, jumping to conclusions can lead to misunderstandings. Eating breakfast doesn't automatically make you healthy, nor does skipping it necessarily boost your metabolism. What's important is "what and how you eat in the morning," or if you don't eat, "how you adjust your meals afterward."

Metabolism is not solely influenced by the presence or absence of breakfast

Metabolism is a series of processes that convert food into energy, maintain body temperature, sustain muscles and organs, and eliminate waste. It's often said that "eating breakfast boosts metabolism," but this is somewhat oversimplified.

When you eat, energy is used for digestion and absorption. However, taking a bite in the morning doesn't dramatically increase your basal metabolism. The real issue is the relationship between blood sugar, insulin, and the body's internal clock.

The human body has rhythms that regulate sleep, hormone secretion, body temperature, and digestive functions. From morning to noon, it's considered a time when energy is more easily utilized for activity, while the same meal late at night can raise blood sugar levels more easily. Therefore, what's important for metabolism is not just "whether you ate breakfast," but "whether you are consuming content that is easy for the body to process at a time when it can process it easily."

The danger is not "breakfast" itself, but a breakfast that disrupts blood sugar levels

The headline of the WELT article mentions "the potential for certain ways of starting the day to significantly disrupt blood sugar levels." A typical example imagined here is a breakfast consisting only of white bread with sweet jam, pastries, sugar-laden cereals, or fruit juice.

Such menus are convenient and can lift your morning mood. However, when refined carbohydrates and sugars are the focus, blood sugar levels can spike easily. When blood sugar rises suddenly, the body secretes insulin to lower it. As a result, a few hours later, you may feel as if your blood sugar has dropped too much, leading to drowsiness, hunger, decreased concentration, and cravings for sweets.

In other words, for those who say, "I eat breakfast, but I'm ravenously hungry before noon," it may not just be that the breakfast quantity is insufficient, but that its content is likely to disrupt blood sugar levels.

If you are considering a metabolism-friendly breakfast, the key is to combine proteins, dietary fiber, fats, and unrefined carbohydrates. Combining eggs, yogurt, fish, soy products, nuts, whole grains, vegetables, and fruits can lead to a relatively gradual absorption of sugars and prolonged satisfaction.

On the other hand, breakfasts consisting only of orange juice, pastries, or sweet café lattes can cause energy fluctuations in the body in a short time compared to the immediate satisfaction they provide.

"Skipping Breakfast" and "Fasting" Are Not the Same

This is where opinions particularly diverge on social media. Skipping breakfast cannot be immediately labeled as "unhealthy" or "healthy." This is because the reasons for skipping breakfast and the subsequent eating habits vary greatly among individuals.

For example, if someone eats late into the night, feels too heavy to eat in the morning, consumes a large meal at lunch due to hunger, snacks on sweets in the evening, and eats late again at night, this is simply "skipping breakfast" and cannot be said to be a well-regulated rhythm for metabolism.

On the other hand, some people finish dinner early, avoid late-night snacks, get by with water or unsweetened tea until noon the next day, and ensure they get the necessary nutrients in their lunch and dinner. This is closer to time-restricted eating or intermittent fasting. Even if the number of meals is reduced, if the overall nutritional plan is in place, it differs from mere skipping of meals.

Recent studies have also reported associations between skipping breakfast and metabolic syndrome, high blood sugar, high blood pressure, and lipid abnormalities. On the other hand, planned time-restricted eating has shown studies indicating improvements in weight management and insulin sensitivity. What is important here is not the rough understanding that "skipping breakfast makes you healthy," but the idea of "adjusting meal times and avoiding overeating late at night."

From the Perspective of the Body Clock, "Eating Late at Night" Is More Likely to Be a Problem

What tends to be overlooked in the breakfast debate is the presence of dinner or late-night meals. Continuing to eat late into the night is more likely to negatively affect blood sugar and lipid metabolism than whether or not you eat breakfast.

The body shifts towards rest and repair at night. Introducing large amounts of carbohydrates or fats at this time can reduce the efficiency of blood sugar and lipid processing. It can also affect the quality of sleep. Even if you think you're skipping breakfast, you might actually just be carrying over what you ate late at night to the morning.

Ideally, meal times should be as close to daytime as possible to align with the body clock. Those who eat breakfast should choose content that doesn't cause a rapid rise in blood sugar. Those who skip breakfast should avoid late-night meals and not cram nutrients haphazardly after noon. These two approaches, while seemingly opposing, actually point in the same direction.

On Social Media, "It Depends on the Person" Is a Strong Reaction

Reactions to breakfast and fasting on social media and forums are largely divided into three categories.

The first is the voice saying, "I feel better when I eat breakfast." Many practical opinions include not being able to concentrate without eating something in the morning, needing food to take medication, coffee on an empty stomach irritating the stomach, and increased snacking during work. Especially for those with high activity levels, those who exercise in the morning, and those prone to unstable blood sugar levels, breakfast is not just a habit but part of health management.

The second is the voice of the fasting group saying, "I feel lighter when I don't eat in the morning." Testimonials include feeling sleepy after eating breakfast, being able to concentrate better when hungry until noon, and finding it easier to manage weight with time-restricted eating. These individuals tend to resist being labeled as "unhealthy" for skipping breakfast. In reality, even if they skip breakfast, if they ensure adequate protein and dietary fiber intake during lunch and dinner and avoid late-night snacks, their overall diet may be well-balanced.

The third is the middle ground, saying, "Both sides are too extreme." In Reddit's nutrition-related communities, opinions often state that whether or not to eat breakfast varies greatly depending on individual differences, activity levels, health conditions, sleep, medication, history of eating disorders, and work hours. Some people feel better skipping breakfast, while others experience a surge in appetite. Fasting suits some, while it causes stress for others.

This division of reactions truly illustrates the essence of the breakfast debate. There is no single correct answer for everyone. However, regardless of stance, what should be commonly avoided are sugar-centric breakfasts, late-night overeating, unplanned meal skipping, and relying solely on social media trends for extreme dieting methods.

What Should Japanese People Eat?

When considering Japanese breakfasts, the traditional combination of rice, miso soup, fish, eggs, natto, and vegetables is quite reasonable from a metabolic perspective. This is because it easily includes not only carbohydrates but also proteins, fermented foods, soups, and dietary fiber.

Of course, making a proper set meal every morning is difficult. In reality, combinations can be adjusted even with convenience store or dining out options. Instead of just having an onigiri, add a boiled egg, unsweetened yogurt, tofu, salad, or miso soup. Instead of just pastries and a café latte, combine whole grain bread, eggs, cheese, nuts, and fruits. If you're having just a smoothie, add a protein source.

The important thing is not to use the act of "eating breakfast" as a free pass. Eating sweets in the morning doesn't automatically become healthy just because it's breakfast. Conversely, even if you skip breakfast, if your lunch and dinner are disordered, you can't expect the benefits of fasting.

Who Should Probably Not Skip Breakfast

Skipping breakfast or fasting is not suitable for everyone. Those with diabetes or blood sugar control issues, pregnant or breastfeeding women, growing children or students, those with a history of eating disorders, those who need meals due to medication, and those who engage in intense physical activity in the morning should not start extreme fasting on their own judgment.

Moreover, if skipping breakfast results in binge eating at lunch or dinner, increased consumption of sweet drinks, more late-night snacks, strong fatigue, irritability, or disrupted sleep, the method may not suit your body.

On the other hand, for those who don't feel hungry in the morning, have an early dinner, have well-balanced meals after noon, and maintain stable health, there may be no need to force breakfast. The key is not to fit yourself to trendy methods but to observe your own blood sugar, hunger, concentration, sleep, and weight changes.

What Metabolism Really Needs

Breakfast or fasting? This question seems like a binary choice, but it is not.

What metabolism needs is not a meal named "breakfast." Nor is it a simple rule that "the longer you go without eating, the better."

What metabolism needs is meal times that do not deviate too much from the body clock, content that does not cause drastic fluctuations in blood sugar, a design that fulfills necessary nutrients, and a rhythm that can be sustained without strain.

If you eat breakfast, don't just finish with sweet bread and juice; add protein and dietary fiber. If you skip breakfast, avoid late-night overeating and don't cram nutrients haphazardly after noon. Regardless of the choice, the key to regulating metabolism lies in "regularity" and "quality."

On social media, breakfast and fasting groups tend to clash. However, scientifically speaking, the real danger is not in eating or skipping breakfast, but in ignoring your own health and following trends blindly.

What's needed at the breakfast table is not a perfect answer but a reproducible choice that allows your body to start the day stably.

Source URL

WELT "Stoffwechsel: Frühstück oder Fasten? Was der Stoffwechsel wirklich braucht"
An article addressing breakfast or fasting from the perspectives of metabolism, blood sugar, and the body clock.
https://www.welt.de/gesundheit/plus69dc9b0b5be318f759f0b469/stoffwechsel-fruehstueck-oder-fasten-was-der-stoffwechsel-wirklich-braucht.html

MDPI Nutrients "Association of Skipping Breakfast with Metabolic Syndrome and Its Components"
A systematic review/meta-analysis addressing the association between skipping breakfast and metabolic syndrome, high blood sugar, high blood pressure, and lipid abnormalities.
https://www.mdpi.com/2072-6643/17/19/3155

PubMed "Early Time-Restricted Feeding Improves Insulin Sensitivity, Blood Pressure, and Oxidative Stress Even without Weight Loss in Men with Prediabetes"
A study examining the effects of early time-restricted feeding on insulin sensitivity, blood pressure, and oxidative stress.
https://pubmed.ncbi.nlm.nih.gov/29754952/

NIH PMC "Breakfast skipping and the risk of type 2 diabetes"
A meta-analysis examining the association between skipping breakfast and the risk of type 2 diabetes.
https://pmc.ncbi.nlm.nih.gov/articles/PMC10271832/

Reddit r/nutrition "Early breakfast vs intermittent fasting?"
Reference for general user reactions and discussions on breakfast and intermittent fasting.
https://www.reddit.com/r/nutrition/comments/t60li1/early_breakfast_vs_intermittent_fasting/

Reddit r/nutrition "How did breakfast go from being the most important meal of the day to being skipped regularly as part of intermittent fasting, etc.?"
Reference for reactions on social media and forums regarding the importance of breakfast and the fasting trend.
https://www.reddit.com/r/nutrition/comments/yrm54a/how_did_breakfast_go_from_being_the_most/

Reddit r/nutrition "Is skipping breakfast beneficial?"
Reference for reactions on social media regarding the benefits, concerns, and individual differences of skipping breakfast.
https://www.reddit.com/r/nutrition/comments/1047tbw/is_skipping_breakfast_beneficial/