Control Group: Diet Group Among those who applied to the clinic, those who want to follow their diet will be randomized into this group. Patients in this group will be followed by a personalized diet and be followed up by a dietician.

Among those who applied to the clinic, those who want to follow their diet will be randomized into this group. Patients in this group will be followed by a personalized diet and will receive 2 capsules which100 grams of standardized oleuropein-containing olive leaf extract.

Patient in "Diet Group" and "Oleuropein and Diet Group" will be given a personalized diet and be followed up by a dietician.

The fasting blood glucose (mg/dl) at the baseline and 6 weeks later noted from the routinely requested tests in the hospital. These values recorded for all groups.

The fasting blood glucose (mg/dl) at the baseline and 6 weeks later noted from the routinely requested tests in the hospital. These values recorded for all groups.

Triglyceride (TG) (mg/dl), high density lipoprotein (HDL-C) (mg/dl), low density lipoprotein (LDL-C) (mg/dl), Total Cholesterol (mg/dl) at the baseline and 6 weeks later noted from the routinely requested tests in the hospital. These values recorded for all groups.

The fasting blood glucose (mg/dl) and fasting insulin (mU/L) values of the individuals with metabolic syndrome at the baseline and 6 weeks later noted from the routinely requested tests in the hospital. HOMA-IR calculated with the formula (fasting glucose (mg/dl) x fasting insulin (mU/L)) / 405. These values recorded for all groups.

The body weight (kg) and height (m) of the individuals with metabolic syndrome were measured at the baseline and again after 6 weeks by the researcher, who noted the values in their files. The height of the patients was measured with a fixed height meter at 0.5 cm intervals, with shoes off.

For body analysis, an 8-electrode bioelectrical impedance (BIA) device, Inbody 270, which performs segmental analysis, was used. Patients were asked to remove all metal items (rings, earrings, bracelets, watches, phones, etc.), any heavy clothing, shoes, and socks before stepping on the device. The device was set to -1.0 kg to account for the remaining clothes.

From these measurements, body weight, body fat (kg), body fat percentage (%), body muscle (kg), and body water (kg) values were recorded. Body mass index (BMI) was calculated as weight (kg) divided by height (m) squared.