"对于早餐来说" can be translated into English as "for breakfast" or "when it comes to breakfast", depending on the context and desired emphasis.
"For breakfast" is a concise and commonly used phrase when referring to breakfast-related topics, such as in sentences like: "For breakfast, I usually have cereal and milk."（我早餐通常吃麦片和牛奶。）
"When it comes to breakfast" is slightly more formal and can be used to introduce a discussion or statement specifically about breakfast, as in: "When it comes to breakfast, I prefer something light and healthy."（说到早餐，我更喜欢清淡健康的食物。）