In 1928, Dr. Lucy Wills (1888-1964), an English hematologist traveled to Mumbai, India to investigate macrocytic anemia, prevalent in pregnant textile workers. She found that the anemia was prevented by adding yeast to the diet and in 1931 published a paper showing that a popular spread introduced in 1902 by the Marmite Food Company that contained brewer's yeast cured this particular anemia. Marmite has high concentrations of folate and vitamin B12.