Its sweetener is linked to headaches Early studies on aspartame and anecdotal evidence suggests that this artificial sweetener may trigger headaches in some people. "I have several clients who used to suffer from migraines and pinpointed their cause to diet soda," Bjork says.

Its sweetener is linked to headaches

Early studies on aspartame and anecdotal evidence suggests that this artificial sweetener may trigger headaches in some people. "I have several clients who used to suffer from migraines and pinpointed their cause to diet soda," Bjork says.