Obesity increases the risk of which of the following health issues?

Obesity is a well-documented risk factor for various health issues, and hypertension, also known as high blood pressure, is one of the most significant. When an individual is obese, excess body fat can lead to several physiological changes that increase the resistance in blood vessels, forcing the heart to work harder to pump blood. This increased workload on the cardiovascular system can result in elevated blood pressure levels. Over time, hypertension can lead to severe health consequences, including heart disease, stroke, and kidney problems.

In contrast, the other options do not have a strong or direct correlation with obesity. Type 1 diabetes, for instance, is an autoimmune condition that is not influenced by body weight. Chronic fatigue syndrome and allergies are complex conditions that may not be directly caused by obesity and involve multiple other factors such as genetics, environment, and lifestyle. Therefore, hypertension stands out as the health issue most closely linked to the risks associated with obesity.