diet (1,977 vegan calories a day), exercise (an hour a day, high-intensity three times a week) and sleep (at the same time every night, after two hours wearing glasses that block blue light). In the interest of fine-tuning this program, Johnson constantly monitors his vital signs. Each month, he also endures dozens of medical procedures, some quite extreme and painful, then measures their results with additional blood tests, MRIs, ultrasounds and colonoscopies.