Which of the following is an effect of a sedentary lifestyle?

A sedentary lifestyle is characterized by a lack of physical activity and prolonged periods of sitting or inactivity. One of the primary effects of such a lifestyle is weight gain and the development of various health issues. When individuals do not engage in regular exercise or physical activity, they may consume calories that are not burned off, leading to an excess amount of energy stored as fat. This can contribute to obesity and related health disorders, including type 2 diabetes, heart disease, and other metabolic conditions.

Furthermore, a sedentary lifestyle often results in other negative health outcomes such as weakened muscles, poor cardiovascular health, and increased risk of chronic diseases. By understanding this connection, it becomes clear why weight gain and health issues are directly associated with a lack of activity, distinguishing it as the correct answer in this context.