Final answer:
The strongest risk factor for late-onset Alzheimer's is a genetic variant called APOE E4. Other risk factors include hypertension, diabetes, obesity, poor nutrition, lack of physical activity, and tobacco use.
Step-by-step explanation:
The strongest risk factor for late-onset Alzheimer's is a genetic variant called apolipoprotein E (APOE) E4. People who carry this variant are more likely to develop the disease. In addition to APOE E4, other genes have also been identified that may contribute to the development of late-onset Alzheimer's disease.
Aside from genetics, there are other risk factors for Alzheimer's disease such as hypertension, diabetes, obesity, poor nutrition, lack of physical activity, and tobacco use.
It's important to note that having these risk factors doesn't guarantee that someone will develop Alzheimer's, as the disease is complex and influenced by multiple factors.