TODAY MY BROTHER SAID "I'M NOT GOING TO EAT TODAY BECAUSE I HAVE A HEADACHE"; HYPOGLYCAEMIC HEADACHES AND MIGRAINE. FASTING, EATING HIGH-SUGAR FOODS, DIETING TOO RIGOROUSLY, AND SKIPPING MEALS CAN ALL TRIGGER, OR MAKE PEOPLE MORE LIKELY TO HAVE A HEADACHE OR MIGRAINE. EVEN DELAYED OR IRREGULAR MEALS CAN MAKE A DIFFERENCE. THIS IS USUALLY DUE TO PEOPLE'S BLOOD-GLUCOSE LEVELS FALLING TOO LOW.