Metabolic syndrome can build quietly while a person feels mostly fine. A larger waist, rising blood sugar, abnormal blood fats, and high blood pressure can arrive together, increasing the risk of heart disease, stroke, and type 2 diabetes.
Italian epidemiologist Franco Berrino says the body may begin responding surprisingly fast when a sedentary routine and heavily processed food give way to daily movement and a genuine Mediterranean diet. His message is hopeful, but it is not a promise of an overnight cure.
What metabolic syndrome means
Metabolic syndrome is not one disease. It is diagnosed when a person has at least three of five problems, including high blood glucose, high triglycerides, low HDL cholesterol, high blood pressure, and excess fat around the waist. Roughly one in three U.S. adults is affected.
The common thread is often insulin resistance, which means cells do not respond properly to insulin and the body struggles to move sugar out of the blood.
Metabolic syndrome is also commonly associated with low-grade inflammation and impaired blood vessel function, helping explain why the cluster matters beyond any single test result.
Why improvement can come quickly
“After only a few weeks of the diet, we saw reductions in blood sugar, triglycerides, cholesterol, waist circumference, and blood pressure,” he wrote. He added that rigorous clinical trials have shown the syndrome can regress within months.
Regression has a specific meaning here. It means a person improves enough to no longer meet the diagnostic threshold for metabolic syndrome, not that the underlying tendency has disappeared forever. Old habits, weight gain, illness, or aging can push those numbers back in the wrong direction.
Still, early movement in laboratory results is plausible. Replacing sugary drinks, excess alcohol, salty packaged foods, trans fats, and large amounts of saturated fat with fiber-rich plant foods changes several risk factors at once. That is why blood tests may move before a person sees dramatic weight loss.
A major trial supports the pattern
One influential randomized trial led by Katherine Esposito followed 180 sedentary adults with metabolic syndrome in Italy. Half received detailed advice to eat more whole grains, vegetables, fruit, nuts, and olive oil, while the others followed a more general lower-fat diet.
After two years, only 40 people in the Mediterranean diet group still met the syndrome’s criteria, compared with 78 in the control group.
The Mediterranean group also lost about 9 pounds on average, versus roughly 3 pounds in the comparison group, while showing better insulin sensitivity and lower inflammatory markers.
That does not mean olive oil alone produced the result. Participants changed an entire eating pattern and received structured guidance.
In practical terms, the benefit came from what filled the plate day after day, not from adding one fashionable ingredient to an otherwise unchanged diet.
What a real Mediterranean diet looks like
The traditional pattern centers on vegetables, beans, lentils, whole grains, fruit, nuts, and extra-virgin olive oil. Fish and cheese appear in moderate amounts, while red and processed meats, sweets, sugary drinks, and ultra-processed foods become occasional choices rather than everyday staples.
Extra-virgin olive oil contains polyphenols, plant compounds studied for their effects on inflammation and oxidation, but the diet works as a team. A drizzle of oil cannot cancel out a day built around soda, packaged snacks, and processed meat.
Movement matters too. U.S. guidance recommends at least 150 minutes of moderate activity each week, along with muscle-strengthening exercise on two days.
A brisk walk after dinner, taking the stairs, or breaking up long hours at a desk may sound ordinary, but ordinary habits are often the ones people can keep.
Why cancer researchers are paying attention
The commentary also points to work at the Milan National Cancer Institute linking metabolic syndrome with breast cancer prognosis and recurrence.
Researchers have examined how abdominal obesity, insulin resistance, and related metabolic changes may be associated with outcomes after a breast cancer diagnosis.
Those findings do not prove that changing diet alone prevents a tumor or stops a recurrence. They do show why oncology researchers care about blood sugar, waist size, blood pressure, and blood fats rather than treating them as unrelated numbers on a laboratory report.
Lifestyle first, but not medicine-free
For many people, food, activity, and weight management are central parts of treatment. However, the American Heart Association notes that medications may still be needed when lifestyle changes do not adequately control blood pressure, cholesterol, or other conditions related to metabolic syndrome.
That is the important balance. A Mediterranean lifestyle can be powerful and may produce measurable changes sooner than expected, but no one should stop prescribed medication without medical guidance.
A clinician can track the five risk factors and determine whether improvement is real, sustained, and safe.
The original commentary was published in Corriere della Sera.
