Which of the following is NOT a risk factor for breast cancer?alcohol useearly onset of menstruationlater menopauseexercise

To determine which of the following options is NOT a risk factor for breast cancer, it's important to analyze each choice based on established research:

1. Alcohol Use: Studies have shown that alcohol consumption is linked to a higher risk of breast cancer. This is due to alcohol's effect on hormone levels and its potential to damage DNA.

2. Early Onset of Menstruation: Starting menstruation at an early age has been associated with an increased breast cancer risk. The prolonged exposure to estrogen can contribute to the development of breast cancer.

3. Later Menopause: Similar to early menstruation, later onset of menopause can also increase the risk because it leads to a longer lifetime exposure to estrogen.

4. Exercise: Regular physical activity is known to have protective effects against breast cancer and is NOT considered a risk factor. In fact, it is often recommended as part of a healthy lifestyle to help reduce cancer risk.

Conclusion

The correct answer is exercise, as it is not a risk factor for breast cancer and can actually help reduce the risk.