The authors of a randomised trial studied the effect of regular water intake on patients with recurrent headaches. They divided the experiment participants into two groups. The first group drank the same amount of water as usual. And patients from the second group increased their daily intake by 1.5 litres. At the same time, all received recommendations to improve sleep and reduce stress.
After three months, 47 per cent of participants in the group who drank more water reported a significant reduction in headache severity. But its duration and frequency had not changed. In the control group, only 25% of patients reported improvements in their condition.