Final answer:
The most likely factor that contributes to an unhealthy body weight is excess fat. Excess muscle mass, excess skin and bones, and excess water do not contribute to an unhealthy body weight.
Step-by-step explanation:
The most likely factor that contributes to an unhealthy body weight is excess fat. Excess fat can lead to obesity and various health issues such as heart disease, high blood pressure, and diabetes.
Excess muscle mass does not contribute to an unhealthy body weight as muscles are essential for overall strength and mobility. Excess skin and bones are not typically responsible for weight gain. Excess water is not a reliable factor in determining unhealthy body weight as it can fluctuate throughout the day due to hydration levels.
Learn more about unhealthy body weight