體重現況與認知的一致性 (Concordance between Weight Status and Weight Perception) 是健康管理的重要環節，錯誤的體重認知可能讓人疏於管控體重也會影響個人行為甚至心理問題。

此研究主要目的有三個，首先探討台灣人口在年輕、中年以及高齡三個年齡層體重認知有何差異；第二，了解兩性間體重認知的不同；第三，初步分析何種人口學特徵的台灣人容易產生錯誤體重認知，以利相關單位聚焦衛教育目標與制定體重管理政策，更能當成高齡族群身體質量指數制定的參考項目。

研究採用2011年東亞社會調查（East Asia Social Survey）分析與相關文獻探討，樣本數=2040人。年齡部份，我們將18-39歲視為年輕族群；40-64歸類為中年族群；65歲或以上則是高齡族群。身體質量指數 (Body Mass Index) 切點依照衛福部定義以18.49以下為體重過輕；BMI 18.50-23.99屬於體重適中；24.00及以上歸類為體重過重。比對實際體重和認知體重後將樣本分為高估體重、正確認知體重、低估體重三大類，再加以分析各項人口學特質。

研究結果發現，26.9%年輕族群高估自己體重，相反地卻有33.3%高齡者低估體重。全樣本高估體重比例女性高於男性(29.2% vs 6.4%)，低估體重比例女性(9.4%)低於男性(28.3%)。傾向高估體重的族群依年齡層如下: 18-39歲族群-女性(OR=5.89);無運動習慣(OR=1.63)。40-64歲-女性(OR=5.27);具有大學或以上學歷(OR=1.66);無慢性疾病(OR=2.52);住都市(OR=1.68)。

傾向高估體重的族群依年齡層分別為:18-39歲族群-男性(OR=6.80);不住都市(OR=2.65)。40-64歲-男性(OR=3.51)。65歲以上-男性(OR=2.49);不處於婚姻關係(OR=2.49)。根據上述結果，自我體重認知依照族群而有不同，也會隨著年齡層及性別有所改變。相關單位應當聚焦衛生教育資源在易有體重錯誤認知的族群上，提升整體正確認知之比例。

Weight perception is one of the vital parts of health management, weight misperception may affect people’s weight control, diet, one’s exercise habit even their psychological dimension. The purposes of this study is to explore weight perception of the three groups, respectively, young age, middle age and elderly in Taiwan. Second, to understand the differences weight perception in gender. Third, try to figure out the characteristics that associated with misperception.

We used the East Asia Social Survey (EASS) database, (n= 2040). Age between 18 to 39 years old belongs to the younger age group; 40-64 years old are classified into the middle age group; over or equal to 65 are divided into the elderly group. According to Ministry of Health and Welfare, Taiwan, body mass index (BMI) ≤ 18.49 is underweight; BMI 18.50-23.99 is normal weight; BMI≥ 24.00 is classified as overweight. Compared the actual weight status and the perceived weight, all samples were divided into three categories: over perception, right perception and underestimation .

Results of this study showed that Young people tend to over-perceive their weight (26.9%); Elderly people tend to under-perceive their weight. (33.3%). The female tends to over-perceive their weight than male (29.2% vs 6.4%); male (28.3%) tends to under-perceive their weight than female (9.4%). 18-39-female (OR=5.89), no exercise habit (OR=1.63). 40-64-female (OR=5.27), college or above (OR=1.66), no chronic disease (OR=2.41), living in urban (OR=1.68) tends to over-perceive weight.
18-39-male (OR=6.803), under college (OR=1.59), do not live in urban (OR=2.65). 40-64-male (OR=3.51). ≥ 65 –male (OR=2.49), not in marital status (OR=2.49), tend to under-perceive weight. To conclude, weight perception differs through ethnics, ages, and gender. Authorities should focus resources on those who tend to misunderstand their weight.

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