Objective: The aim of this study was to evaluate the effects of social appearance anxiety of adult individuals who applied to a private nutrition and diet clinic in Istanbul province on their food choice and its relationship with anthropometric measurements. Method: Social Appearance Anxiety Scale (SAAS) and Food Choice Questionnaire (FCQ) including questions on participants’ sociodemographic characteristics and nutritional status were performed face to face. Data were analyzed with SPSS v26 (IBM Inc., Chicago, II, USA) package program. Results: Mean age of participants was 40.03±12.12 years, mean body mass index (BMI) was 26.93±5.41kg/m², waist circumference was 88.97±18.17 cm., hip circumference was 101.66±17.52cm., waist/hip ratio was 0.88±0.09 cm., waist/height ratio was 0.53±0.10 cm. 197 participants were male and 313 were female. Females’ median total “SAAS” score (U=25352; p<0.01), and FCQ’s “Health” (U=20807; p<0.001), “Mood” (U=23941.5; p<0.001), “Convenience” (U=20520; p<0.001), “Natural Content” (U=22974.5; p<0.001), “Price” (U=27182.5; p<0.05), “Weight Control” (U=20412.5; p<0.001), “Familiarity” (U=22933.5; p<0.001), and “Ethical Anxiety” (U=24077.5; p<0.001) subfactor scores were found to be statistically significantly higher. Mood, Convenience, Natural Content, Weight Control and Ethical Concern subfactor scores decreased with increasing BMI, waist circumference, and waist/hip values (p<0.05). Increasing SAAS total scores also increased FCQ’s mood and convenience subfactor scores (p<0.05). Conclusion: High Social Appearance Anxiety affect food choice and body compositions.