Lactose intolerance is a frequent reason to avoid milk and dairy products. What is lactose?

a sugar

a lactic acid

a protein

a process of milk fermentation

Lactose is a disaccharide sugar that makes up around 2-8% of milk. Lactose intolerance is not an allergy. It is the inability to digest lactose due to insufficient levels of lactase, the enzyme that metabolizes lactose into glucose and galactose.

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17%

1282

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197

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122

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14%

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13%

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174

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30688

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1335

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697

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26%

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183

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919

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15%

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1611

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166

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610

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162

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158

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119

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