Skipping breakfast isn’t automatically bad for you, but it isn’t risk-free for everyone either. Controlled studies show it doesn’t slow your metabolism or cause weight gain on its own. Larger long-term studies, however, link regularly skipping breakfast to higher heart disease risk, and some trials show it can raise cholesterol. The answer depends on who you are, what you eat the rest of the day and when you eat.
New research suggests timing may matter more than skipping itself. A 2026 study led by the Barcelona Institute for Global Health found that a longer overnight fast combined with an early breakfast was linked to lower body mass index over time. In a subgroup of men who skipped breakfast as part of intermittent fasting, researchers saw no effect on body weight, and they didn’t see a similar pattern in women. In other words, eating earlier may matter more than eating less.
Does skipping breakfast slow your metabolism?
No. The idea that breakfast ‘jump-starts your metabolism is still common, but research doesn’t support it. Studies show people burn the same number of calories over 24 hours whether they eat breakfast or skip it, according to Healthline’s review of the research. What matters most is how much you eat over the full day, not when you start.
Does skipping breakfast make you gain weight?
Not on its own. In a four-month randomized trial of 309 adults with overweight or obesity, there was no difference in weight between those told to eat breakfast and those told to skip it. Skippers often eat more at lunch, but usually not enough to make up for the missed meal.
There may be a tradeoff. A review of randomized trials and cohort studies concluded that skipping breakfast may lower body weight slightly while also raising LDL cholesterol, the harmful kind.
Is skipping breakfast bad for your heart?
This is where the warning signs appear. A combined analysis of nine observational studies involving more than 2.3 million people found that those who skipped breakfast had 17% higher odds of cardiovascular disease. These studies can’t prove that skipping breakfast causes heart disease. People who skip breakfast also tend to smoke more, drink more and exercise less.
The science is still evolving. A 2026 study in Frontiers in Nutrition that linked skipping breakfast to metabolic syndrome has since been retracted.
For Black Americans, heart health is a bigger concern. More than half of Black adults have high blood pressure, according to the American Heart Association. If skipping breakfast raises your LDL cholesterol even slightly, it’s worth talking with your doctor before making it a daily habit.
What happens when teens skip breakfast?
For younger people, breakfast may help fill nutrition gaps. A study presented at NUTRITION 2026 followed 128 teens and young adults ages 14 to 21 who skipped breakfast at least six times a week. Those assigned to eat breakfast took in more fiber, iron, zinc and choline and ate fewer desserts and sweets than those who kept skipping.
Who should think twice before skipping breakfast?
Skipping breakfast doesn’t work for everyone. Some people get headaches, feel lightheaded, have trouble focusing or experience blood sugar drops. People with diabetes who take blood sugar medication, pregnant women and growing teens should talk with a doctor or dietitian before skipping meals regularly.
What’s the smartest way to eat breakfast?
If you’re hungry in the morning, eat a breakfast with protein and fiber, such as eggs, Greek yogurt, oats or whole grain toast with nut butter. Based on the newest research, eating earlier may work better than eating late. If you’re not hungry and feel fine, skipping breakfast is generally OK as long as the rest of your day includes balanced meals.
The answer isn’t the same for everyone. Breakfast isn’t magic, and skipping it isn’t a health hack. The best choice depends on your body, your schedule and your overall health.
