Can the Japanese drink milk or are they lactose intolerant?

Lactose intolerance varies within the Japanese population. Around 20-30% of Japanese individuals may have some degree of lactose intolerance, although not all may experience symptoms. The prevalence is generally lower than in some Western populations, where it can be as high as 75%. Genetic variations, differences in local foods, and adaptation to a lower intake of dairy products over the years may all play a role in this variation.