Objective As more people choose to skip breakfast, this study is to evaluate the impact of breakfast skipping (BS) on human health. Methods We collected and analyzed the results from observational studies, RCT studies, meta analysis and other reviews. Results These studies indicated that BS is associated with high risk of type 2 diabetes, high cardiometabolic risk factors, bone mass loss, and dysmenorrhea in young women. It worsens cognitive outcomes in malnourished children and adolescence. Some evidence established a link between obesity and BS, but some authors argued that the proposed effect of BS on obesity has not yet to establish a causal relationship. In the studies we reviewed, the duration of overnight fasting is rarely speciifed. Including this factor in the studies might result in different conclusions. Conclusions We would suggest that breakfast is as important as other meals of the day. Well-designed epidemiological studies are needed before we can reach further conclusions.%目的不吃早餐（breakfastskipping，BS）的人日益增多，本文讨论不吃早餐对健康的影响。方法通过文献检索，对观察性研究、随机对照研究、meta分析等文献进行综合评述。结果多数研究倾向于吃早餐与低BMI水平有关，不吃早餐可能增加体重，但其因果关系没有得到确认，可能与多数研究没有考虑“过夜禁食时间”有关。不吃早餐还与糖尿病及心血管疾病发病风险增加、骨密度丢失、女性痛经等有关，甚至可能影响儿童及青少年认知能力。结论需要更大样本量、更严谨设计的前瞻性研究才能获得科学的结论，可能早餐只是一天中的一餐，而不一定是“一天中最重要的一餐”。
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