Comment: anectodal evidence goes both ways...

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anectodal evidence goes both ways...

Onset of Lactose intolerance is most likely a result of age in most cases, since all mammals produce lactase in infancy but gradually lose it as they age except for some percentage of the human population which has developed the ability to process it into adulthood because of the beneficial advantage from the domestication of cows.

My mother had the opposite experience as your child -- once she moved to a rural area with farms and nothing but raw milk, she developed lactose intolerance. But she was 16-18 years old at the time, which is a normal age to first experience symptoms -- the increased consumption of milk in that environment exacerbated the symptoms. The rawness of the milk was irrelevant.

(not that people might not have taste or health preferences for raw milk and thus should be legal. However, the lactose content of the milk are unchanged).