Final answer:
Excess visceral fat accumulation is the biggest risk factor for the development of chronic diseases.
Step-by-step explanation:
The biggest risk factor for the development of chronic diseases, including diabetes mellitus type 2, cancer, and cardiovascular disease, is excess visceral fat accumulation. Visceral fat refers to the fat that accumulates around the inner organs in the abdominal area. This type of fat is metabolically active and releases harmful substances that can lead to chronic inflammation and insulin resistance, contributing to the development of these diseases.
Excess visceral fat can be caused by factors such as a sedentary lifestyle, unhealthy diet, and genetic predisposition. It is important to maintain a healthy weight and engage in regular physical activity to reduce the risk of developing these chronic diseases.