Final answer:
Lactose intolerance typically causes gastrointestinal symptoms, but it can also lead to tiredness and weight loss. These symptoms occur due to the body's reaction to undigested lactose and potential nutrient malabsorption. The condition is mostly due to a lack of the enzyme lactase needed to digest lactose.
Step-by-step explanation:
Symptoms of Lactose Intolerance Beyond the Gastrointestinal Tract
While the most common symptoms of lactose intolerance are gastrointestinal, such as gas, abdominal cramps, bloating, and diarrhea, there are additional symptoms that might not be directly related to the digestive system. Some individuals may experience tiredness, likely due to the metabolic distress and discomfort caused by the body's reaction to undigested lactose. Additionally, chronic malabsorption of nutrients caused by ongoing lactose intolerance can lead to weight loss over time. Although lactose intolerance symptoms typically resolve once the lactose passes through the digestive system, the impact on overall energy levels and body composition can be significant.
Lactose intolerance is a consequence of insufficient production of lactase, an enzyme produced by the cells of the small intestine, which is necessary for lactose digestion. The disorder can be genetic in origin, as in certain populations that lack the ability to produce enough lactase with age. In others, lactose intolerance can be due to an inheritable deficiency, such as in the case of congenital lactase deficiency or galactosemia. For those affected by this intolerance, consuming lactose-free products is vital to avoid symptoms and maintain health.