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People therefore converted milk to curd, cheese and other products to reduce the levels of lactose.
Thousands of years ago, a chance mutation spread in human populations in Europe that enabled the production of lactase in adulthood.
Over the last three decades of the 19th century, demand for milk in most parts of the country doubled, or in some cases, tripled.
Legislation in 1875 made the adulteration of milk illegal - this combined with a marketing campaign to change the image of milk.
Milk is a white liquid produced by the mammary glands of mammals.
Urban demand began to grow, as consumer purchasing power increased and milk became regarded as a required daily commodity.
In many cultures, especially in the West, humans continue to consume milk beyond infancy, using the milk of other mammals (especially cattle, goats and sheep) as a food product.
Initially, the ability to digest milk was limited to children as adults did not produce lactase, an enzyme necessary for digesting the lactose in milk.
The first glass bottle packaging for milk was used in the 1870s.
The first company to do so may have been the New York Dairy Company in 1877.