lactose

Imagine a warm glass of milk - some of its sweetness comes from lactose. It is a natural sugar found in milk and other dairy foods like cheese and yogurt. Baby mammals use it for energy as they grow, but some people have trouble digesting it as they get older. This problem is called lactose intolerance. It happens when the body does not make enough lactase, the enzyme that breaks this sugar into smaller parts the body can absorb. Without enough lactase, it can lead to bloating, gas, and stomach discomfort. So if you see "lactose-free" on a label, it means the sugar has been removed or broken down to make the food easier to digest.

Lactose is a disaccharide sugar - that is, it is made of two simpler sugars joined together: glucose and galactose. It is naturally present in the milk of mammals and is the main carbohydrate in milk for young animals. Think about calves needing milk to grow strong - this sugar helps provide that energy.

In humans, an enzyme called lactase breaks it down into those smaller sugars in the small intestine. However, many people produce less lactase after infancy, which can lead to lactose intolerance. This is not the same as a milk allergy; it is a digestive problem. Symptoms can range from mild bloating and gas to stronger stomach problems, depending on how little lactase the body makes.

Lactose intolerance is more common in some populations than in others, including many people of Asian, African, or Native American descent. Researchers think this is linked to long-term food habits in different parts of the world. Groups with less history of dairy use were less likely to keep making high levels of lactase into adulthood.

Today, many dairy products come in lactose-free versions, and lactase supplements are sold over the counter to help people digest it more easily. From ice cream to milkshakes, understanding lactose can help people make better choices about what they eat and how their bodies handle dairy.