What should be avoided on the day of a mammogram to ensure accurate results?

The correct choice focuses on avoiding the use of lotions and deodorants on the day of a mammogram to ensure accurate imaging results. Lotions, creams, and deodorants can contain substances that may be detected on the mammogram images, leading to artifacts or abnormalities that could be misinterpreted as areas of concern. These can obscure the radiologist's ability to accurately assess breast tissue and may result in unnecessary additional imaging or even biopsies due to false positives.

While other options presented (such as eating a full meal, drinking caffeine, or wearing jewelry) may have some relevance in terms of comfort or convenience, they do not substantially impact the quality or clarity of the mammogram images as much as the potential interference from lotions and deodorants. Thus, it is crucial for patients to adhere to the guideline of avoiding these products to facilitate a clear and comprehensive evaluation of breast health during mammography.