Headache is a common disease in general population, which affects adult women more frequently than men. Among different factors which might be involved in the pathophysiology of the disease, eating or drinking a particular food or drink have been shown to act as a trigger of acute attacks. In particular foods such as aged cheese or red wine may trigger acute migraine attacks and dietary habits such as excessive caffeine intake may increase headache frequency.
Moreover a close relationship has been detected between overweight/obesity and migraine severity even if other authors showed that obesity at baseline does not seem to be related to follow-up refractoriness to preventive treatment.
At the first visit, patients will undergo a complete clinical examination and body weight (BW), height (HT), blood pressure (SBP/DBP) and heart rate (HR) will be also measured. Body mass index (BMI) will be calculated as BW/HT2 and expressed in kg/m2. We consider overweight patients with BMI\> 25 and \< 30 whilst frankly obese are those with BMI \> 30. Patients will be followed-up for two months when treatment for the prevention of headache (usually the calcium entry blocker flunarizine 5 mg/day) will be added to the habitual dietary regimen. At the end of this run-in period all patients will be randomly attributed to one of the following two dietary regimens: a low lipid diet with a lipid content \< 20% of the total daily energy intake and a normal lipid diet with a lipid intake between 25-30% of the total daily energy intake. In both diet lipid intake is mostly represented by monounsaturated fatty acids (14% in the low lipid and 19% in the normal lipid diet) with a low intake of saturated fats (\< 8%of the total calories, which is the percentage usually recommend in our diets). Patients will be followed-up for 2 months at the end of which they will be switched to the alternative dietary regimen.
At baseline and during the observation period patients will be seen at the Headache Outpatient Clinic of our department at one month intervals. At each visit they will be given a form to be filled at home, summarizing the number of the monthly headache attacks, the severity of each one graded from 0.1 to 3 from mild to severe pain, and how many times they assumed pills for the therapy of the attacks during the last month. Headache attacks with severe pain will be considered those receiving a score \> 2.5. Moreover, at each visit patients will fill-up a food questionnaire, validated in comparison to the 7-day food record (12), with the help of a well trained dietician. Data are expressed as daily percent caloric intake from each macronutrient and as the weekly number of a medium size serving.
Main drugs suggested for the pain relief at each attack are the selective serotonin receptor agonists (triptans), which are abortive migraine medications, and the non steroidal anti-inflammatory agents.
In a randomly selected subgroup of patients we will evaluate at baseline and after diet:
1. Vascular dysfunction by echography at the brachial artery level after ischaemia (Flow mediated dilatation) and after nitroglycerin 0.3 mg;
2. Intimal-media thickness at carotid artery level will be evaluated by b-mode echography;
3. central pressure and pulse wave velocity by tonometry applanation.
