Caffeine ingestion and breast cancer. A negative correlation

Area of Science:

• Epidemiology
• Nutritional Science
• Oncology

Background:

• Previous research suggested a potential link between caffeine consumption and an increased risk of breast cancer.
• Some studies indicated caffeine might exacerbate fibrocystic breast disease, raising concerns about its role in breast cancer development.

Purpose of the Study:

• To investigate the association between caffeine intake and breast cancer mortality rates globally.
• To determine if caffeine consumption is a significant factor in the international variation of breast cancer incidence.

Main Methods:

• Utilized international aggregate data from 44 countries, correlating breast cancer death rates with caffeine intake from coffee and tea.
• Employed multiple regression analysis to assess the relationship, controlling for other dietary factors, particularly fat intake.

Main Results:

• A significant positive association was found between breast cancer rates and fat intake, explaining 85% of international variation.
• After accounting for fat intake, a negative partial correlation between caffeine intake and breast cancer rates was observed (P < 0.05).
• This negative correlation between caffeine and breast cancer disappeared when data were weighted by country population, while the association with fat intake remained strong.

Conclusions:

• The study does not support a positive association between caffeine intake and the subsequent development of breast cancer.
• Dietary fat intake appears to be a more significant factor in international variations of breast cancer rates than caffeine consumption.