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Eating a Balanced Breakfast Reduces Obesity and Heart Disease - Science Confirms


Research indicates that a nutritious breakfast making up 20-30% of daily calories can reduce cardiovascular risk factors.

Eating 20-30% of daily calories at breakfast positively affects key cardiovascular risk factors. People who meet this energy range in the morning tend to have:

2-3.5% lower body mass index (BMI)

2-4% smaller waist circumference (less abdominal obesity)

9-18% lower triglyceride levels

4-8.5% higher HDL cholesterol (the “good” cholesterol)

A high-quality breakfast with a balanced mix of proteins, healthy fats, fiber, calcium, and iron is also linked to:

1.5% smaller waist circumference

4% lower triglycerides

3% higher HDL cholesterol


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These findings come from a three-year study involving nearly 400 participants in the PREDIMED-Plus project, which examines how the Mediterranean diet affects heart health.

Breakfast and Cardiovascular Health

Eating a nutritious breakfast that provides about a quarter of daily calorie needs can help lower the risk of cardiovascular disease, according to a study by the Hospital del Mar Research Institute, published in the Journal of Nutrition, Health and Aging.

Researchers tracked 383 participants in the PREDIMED-Plus project, a randomized clinical trial comparing the effects of a Mediterranean diet combined with physical activity versus standard dietary advice on heart health. This study is the first to examine how both the amount of energy consumed at breakfast and its nutritional quality impact cardiovascular risk factors.

This new work considered two factors. First, the energy intake from breakfast relative to the total daily intake, distinguishing between an adequate calorie intake (20–30% of the daily total) and other levels. Second, the researchers analyzed the effects of consuming a high-quality breakfast with a proper balance of proteins, fats, fiber, and other nutrients. They found that consuming an adequate amount of energy in the morning and doing so with high-quality food contributed to reducing cardiovascular risk factors.


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A Good Breakfast Reduces Obesity

The study followed participants for three years. All were aged between 55 and 75 and had overweight or obesity. Various cardiovascular risk factors were evaluated, including weight, waist circumference an indicator of abdominal obesity, lipid profile cholesterol and triglyceride levels, blood pressure, and diabetes markers.

The results indicate that participants who consumed 20–30% of daily energy intake in the morning had better outcomes for several risk factors. Their body weight evolved more favorably compared to participants who consumed more or less energy at breakfast. By the end of the study, these participants had a 2–3.5% lower body mass index and a 2–4% smaller waist circumference. Adequate energy intake at breakfast was also linked to significantly lower triglyceride levels (9–18% reduction) and higher HDL cholesterol levels (4–8.5% increase). Other markers showed less significant changes.

Significance of Quality Breakfast

In terms of breakfast quality, the results were also positive. Participants who had a high-quality breakfast had 1.5% smaller waist circumference, 4% lower triglycerides, and 3% higher HDL cholesterol. A high-quality breakfast includes the right amounts of protein, high-value fats, fiber, and minerals such as potassium and iron, while avoiding excessive added sugars and saturated fats.


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Expert Insights on Healthy Eating

According to Álvaro Hernáez, researcher at the Hospital del Mar Research Institute, CIBER for Cardiovascular Diseases (CIBERCV), and professor at the Blanquerna Faculty of Health Sciences at Ramon Llull University, “Breakfast is the most important meal of the day, but what and how you eat it matters. Eating controlled amounts—not too much or too little—and ensuring good nutritional composition is crucial. Our data show that quality is associated with better cardiovascular risk factor outcomes. It’s as important to have breakfast as it is to have a quality one.”

Dr. Montse Fitó, coordinator of the Cardiovascular Risk and Nutrition Research Group at the Hospital del Mar Research Institute and CIBER for Obesity and Nutrition (CIBEROBN), emphasizes that both energy adequacy and quality are key to preventing cardiovascular risk. “We have confirmed that dietary recommendations about food quality have been effective in improving risk factor evolution over time in adults at high cardiovascular risk,” she says.

The study’s results were adjusted to ensure they are attributable to breakfast energy intake and food quality rather than other factors. This leads Karla-Alejandra Pérez-Vega, a researcher at Hospital del Mar and CIBEROBN, to conclude, “Promoting healthy breakfast habits can contribute to healthy aging by reducing the risk of metabolic syndrome and associated chronic diseases, thereby improving quality of life.”

Reference: “Breakfast energy intake and dietary quality and trajectories of cardiometabolic risk factors in older adults” by Karla-Alejandra Pérez-Vega, Camille Lassale, María-Dolores Zomeño, Olga Castañer, Jordi Salas-Salvadó, F. Javier Basterra-Gortari, Dolores Corella, Ramón Estruch, Emilio Ros, Francisco J. Tinahones, Gemma Blanchart, Mireia Malcampo, Daniel Muñoz-Aguayo, Helmut Schröder, Montserrat Fitó and Álvaro Hernáez, 5 November 2024, The Journal of nutrition, health and aging.

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