Can I smoke or exercise before a glucose tolerance test?

Smoking is not allowed before a glucose tolerance test, and strenuous exercise is also not recommended. The analysis is as follows:

Smoking can affect the results of a glucose tolerance test. Nicotine and other harmful substances in tobacco may interfere with the body's metabolic processes, including blood glucose regulation. Therefore, smoking should be avoided before the glucose tolerance test to ensure the accuracy of the test results.

Strenuous exercise can cause sympathetic nerve excitement, leading to increased release of catecholamine hormones, which in turn can elevate blood glucose levels. This can interfere with the results of the glucose tolerance test, making it difficult for physicians to accurately assess a patient's ability to regulate blood sugar. Additionally, strenuous exercise may trigger other stress responses in the body, further affecting the test results.

Although strenuous exercise is not recommended, moderate physical activity is acceptable. During the three days before the test, patients should maintain normal physical activity, which helps reflect the body's usual state of blood glucose regulation in daily life.

In addition to avoiding smoking and strenuous exercise, patients should maintain a normal diet before the glucose tolerance test, ensuring adequate carbohydrate intake daily and avoiding excessive restriction of staple food consumption. On the evening before the test, patients should have dinner as usual but should not consume any calorie-containing food after 7–8 PM.