THE MAN WHO CHANGED THE WORLD’S UNDERSTANDING OF NUTRITION
FREDERICK GOWLAND HOPKINS
In the early 1900s, dominant views held that animals could thrive on a diet of pure proteins, fats, carbohydrates, and minerals, as long as the calories and macronutrients were right. Hopkins tested this directly, he fed young rats a diet of purified nutrients with all the known essentials accounted for. The rats stopped growing and grew sick, until he added a small amount of milk back into their diet, at which point they recovered and thrived.
That tiny amount of milk could not be explained by protein, fat, or calories. It had to contain something else, something needed only in minute quantities, but essential for life. Hopkins called these "accessory food factors." We now call them vitamins.
This was not a minor refinement, it overturned a paradigm. For centuries, diseases like scurvy, rickets, and beriberi had been mysteries, often blamed on infections, poisons, or climate. Hopkins's work, alongside others who isolated specific vitamins in the following decades, revealed that these were diseases of "absence" (the lack of specific micronutrients). That insight gave public health a new tool, instead of treating symptoms, you could prevent the disease by restoring the missing factor.
Beyond vitamins, Hopkins helped found biochemistry as a serious discipline in Britain, building Cambridge's biochemistry department into a major research center and mentoring a generation of scientists. He also did foundational work on amino acids, including the discovery of tryptophan. He has indeed changed the world from what it used to be.
365 men who changed the world.
Kamikun John, Author 366 days of wisdom.
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