The founder of Deliciously Ella started a blog when suffering from severe chronic pain. Now, her multimillion-dollar snack empire is going global

In 2011, when Ella Mills was 20, chronically ill, and bedridden with fatigue, migraines, and heart palpitations up to 190 beats per minute, she nearly passed out when standing. As a student at St. Andrews University, she had to sleep between 16 and 18 hours a day because the fatigue was unbearable. 

“You’re so dizzy, it’s like your head’s disconnected from your body,” Mills recalls, who had to go home to manage the symptoms. 

Mills, now a mother of two who lives in the UK,...