Final answer:
The client's ethnicity is the main risk factor for type 2 diabetes; his age, BMI, and sister's health condition are not direct contributors.
Step-by-step explanation:
The main risk factor for type 2 diabetes in a 40-year-old Latino man with a BMI of 24 is his ethnicity. Ethnic minorities, including Latinos, have a higher prevalence of type 2 diabetes compared to other groups. Other risk factors mentioned, such as his age and the fact that he has a sister recovering from cancer, do not directly increase his chances of developing type 2 diabetes. His current BMI is within a healthy range (BMI of 18.5-24.9 for adults), so it is not considered a risk factor in this scenario.
Age is a common risk factor for developing type 2 diabetes. Additionally, another risk factor is BMI (Body Mass Index), and your client has a BMI of 24. A higher BMI is associated with an increased risk of developing type 2 diabetes. However, ethnicity is also considered a risk factor for type 2 diabetes, and being Latino can increase the risk.