Which factor is a known contributor to obesity as a risk factor for DVT?

Lack of physical activity is a significant contributor to obesity and is linked to an increased risk of deep vein thrombosis (DVT). Individuals who do not engage in regular physical activity are more likely to accumulate excess weight, which can lead to obesity. Obesity itself is a well-established risk factor for DVT because it can impede blood flow, increase venous pressure, and contribute to a sedentary lifestyle, further exacerbating the risk of clot formation.

In contrast, frequent mobility and an active lifestyle promote healthy blood circulation and reduce the likelihood of blood pooling in the veins, which is a critical factor in preventing DVT. Additionally, a low-calorie diet typically supports weight management, which helps in reducing the risk of obesity and its related complications. Therefore, the lack of physical activity stands out as the correct answer due to its direct correlation with both obesity and the increased risk for DVT.