Key Takeaways
- Low energy and sluggishness are common short-term consequences when your body lacks morning fuel.
- Regularly missing breakfast is linked to disrupted circadian rhythms, nutrient deficiencies, and a higher risk of heart disease.
- A balanced breakfast should include all food groups, including a lean protein and a complex carbohydrate.
Breakfast is usually known as the most important meal of the day, but plenty of us ignore this conventional wisdom in favor of extra sleep, a quick scroll, or another cup of coffee. Skipping that first meal might feel harmless (or maybe even a little productive), but nutritionists say your body is impacted more than you think.
From sluggish mornings and the very real impact of hanger to longer-term patterns that affect your heart health, skipping breakfast can have strong, undesirable ripple effects. We asked dietitians to break down what is actually happening inside your body when you pass on that morning meal, plus how to make better choices to start your day on the right foot.
- Meghan Windham, MPH, RD, LD, registered dietitian, clinical assistant professor, and director for Didactic Program in Dietetics (DPD) at Texas A&M University
- Jennifer Hillis, MS, RDN, registered dietitian nutritionist and citrus nutrition research liaison at the University of South Florida
Short-Term Consequences of Skipping Breakfast
Most health experts agree that breakfast is the most important meal of the day because skipping it often shows up in negative ways within a few short hours. (There are a couple of scenarios where delaying breakfast might be OK.) In general, here are the health consequences you might notice right away.
Attention Deficits
More often than not, missing breakfast altogether is a bad habit that can reduce your ability to focus. “Research indicates that when skipping breakfast, increased appetite and attention deficits can occur,” says Meghan Windham, MPH, RD, LD, registered dietitian. “The brain relies on glucose for optimal function, and poor energy consumption can compromise memory and attention.” That means you may find it harder to focus on work, school, or even everyday tasks when you start the day on an empty stomach.
Less Energy
Not eating in the morning can also leave your body without the fuel it needs to power through the morning. “One of the most noticeable consequences of skipping breakfast is feeling low on energy,” says Jennifer Hillis, MS, RDN, registered dietitian nutritionist. “This may look like feeling sluggish, and your body may feel more fatigued during physical activity and even simple daily tasks.” Think of it like a mid-afternoon energy crash, only earlier.
Hanger
“The term ‘hangry’ may have scientific backing after all,” Windham says. Research has found that prolonged fasting could lead to elevated levels of certain hunger-related hormones linked to increased irritability and aggressive behavior.
In other words, skipping breakfast could trigger your seemingly unrelated mood swings. Rather than brushing off your grumpiness as “just a bad morning,” consider your fasting window and aim to eat breakfast earlier and often.
Long-Term Effects of Skipping Breakfast
Hillis reminded us that the word breakfast literally means “breaking the fast.” Eating breakfast replenishes your blood sugar levels, which is necessary for optimal brain function and overall physical energy. But beyond that, skipping it regularly can have the following long-term effects.
Circadian Rhythm Changes
While it’s unclear exactly how much no breakfast could mess with your sleep, there is growing evidence that it could throw off your body’s internal clock. “Research indicates that when skipping breakfast, your body can experience changes in circadian rhythm,” Windham says. “By missing breakfast, it disrupts biological rhythms, which can also exacerbate metabolic disorders such as insulin resistance.”
One study found that skipping breakfast for six consecutive days delayed the core body temperature rhythm by approximately 42 minutes. However, more research is needed to understand how this disruption impacts long-term health.
Nutrient Deficiencies
Skipping breakfast can also negatively impact your overall nutrition. “Over time, skipping breakfast can lead to missing out on the essential nutrients your body needs to properly function,” Hillis says. “This can lead to deficiencies that negatively impact overall health, such as weakened immune function and metabolic changes.”
Additionally, Hillis pointed to research that recommended front-loading nutrients earlier in the day to support overall health and healthy aging among older adults. (Eating breakfast later in the day was associated with depression, anxiety, and multimorbidity.)
Poor Heart Health
Perhaps more alarmingly, not eating breakfast could increase your cardiovascular risk over time by disrupting metabolic and vascular function. One large meta-analysis of more than 220,000 adults found that those who regularly skipped their morning meal had a roughly 22% higher risk of developing cardiovascular disease compared with regular breakfast eaters. Researchers believe that missing breakfast could trigger unfavorable changes, like elevated LDL cholesterol, which could strain the heart and blood vessels.
What Does a Balanced Breakfast Look Like?
Not all breakfasts are created equal, and aiming for one that is both nutritious and fits into your busy morning routine can be a challenge. Here’s a peek at the ideal: “A balanced breakfast should include all food groups, including low-fat dairy, whole grains, lean protein, and fruits and vegetables,” Windham says. “Your morning meal may consist of a slice of whole grain toast (grain) with a handful of spinach (vegetable) mixed into scrambled eggs (protein), a side of fruit, and a glass of low-fat milk (dairy).”
Hillis recommends always including some type of drink with your breakfast, whether that’s milk or OJ. “Starting the day hydrated can help set the tone for how you feel the rest of the day, and breakfast is a great time to hydrate, with water and other water-rich foods and beverages, like 100% orange juice,” she says.
On-the-Go Ideas
The breakfast formula above isn’t always feasible if you’re on the go. So if you are short on time, aim for a complex carbohydrate and a lean protein at a minimum. “An example might be low-fat Greek yogurt (protein) with berries (carbohydrate) or whole grain bread (carbohydrate) with nut butter (protein),” Windham says.
For on-the-go breakfasts, Hillis says smoothies are a great way to pack in nutrients and customize flavors. “Or prep vanilla overnight oats for a delicious and nutritious breakfast,” she suggests. “The serving of oats and seeds makes it a good source of fiber, and one serving provides a good source of iron.”
