I want to know the answer to the following question:
Who made the observation that the Japanese sailor's diet was the cause for them developing beriberi?
All the background I'm provided with is that "Adding various types of vegetables and meats to the diets of Japanese sailors prevented the disease, (not because of the increased protein as Takaki supposed but because it introduced a few parts per million of thiamine to the diet, later understood as a cure).". Is that enough to answer the question?
Answer: no