When it comes to food, the only thing that really determines breast size is fat intake, and, in fact, fat ingestion can affect the onset of breast growth during puberty. So aside from implants and hormonal manipulation (both of which you should consult your doctor about), the only thing that can have a noticeable affect on breast size is fat. Peanut butter is extremely high in fat content, so, in a word, yes, especially depending on your age (if puberty has not set in), eating peanut butter can affect your breast size. If you are referring to spreading it on your breasts, then the answer is no, spreading peanut butter or, for that matter, any food on your breasts will not affect their size.
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